Medical Exam Past Papers Related to Nervous System

Mastering MCQs on the nervous system is crucial for candidates aiming to excel in the initial tests for medical exam past papers within the medical branches of the Army, Navy, and Air Force, including positions such as General Duty Medical Officer (GDMO) and Captain. These tests assess a candidate’s foundational knowledge and understanding of medical principles, specifically focusing on the complexities of the nervous system, which includes brain function, neural pathways, and nerve-related disorders.

A strong grasp of this subject through diligent practice of MCQs not only enhances the ability to perform under the pressure of time-limited exams but also significantly boosts the likelihood of success. For aspiring military medical officers, thorough preparation using relevant MCQs is indispensable, offering a clear pathway to achieving their career goals in the demanding and prestigious medical branches of the military.

Medical Exam Past Papers with Answers (Part-01)

Q: Which of the following is the primary function of the myelin sheath?

A) To transmit electrical impulses faster
B) To protect the neuron from damage
C) To convert electrical impulses into chemical signals
D) To store neurotransmitters

Correct Answer: A) To transmit electrical impulses faster

Q: What is the main difference between an action potential and a graded potential?

A) Action potentials are always of the same magnitude, while graded potentials vary in magnitude
B) Action potentials occur in the dendrites, while graded potentials occur in the axon
C) Graded potentials are propagated along the axon, while action potentials occur in the soma
D) Action potentials are only excitatory, while graded potentials can be both excitatory and inhibitory

Correct Answer: A) Action potentials are always of the same magnitude, while graded potentials vary in magnitude

Q: Which part of the brain is primarily responsible for regulating heart rate and respiration?

A) Cerebrum
B) Cerebellum
C) Medulla oblongata
D) Thalamus

Correct Answer: C) Medulla oblongata

Q: What type of neuron carries signals from the central nervous system to muscles or glands?

A) Afferent neuron
B) Interneuron
C) Efferent neuron
D) Sensory neuron

Correct Answer: C) Efferent neuron

Q: Which of the following ions is primarily responsible for the depolarization phase of an action potential?

A) Sodium (Na⁺)
B) Potassium (K⁺)
C) Chloride (Cl⁻)
D) Calcium (Ca²⁺)

Correct Answer: A) Sodium (Na⁺)

Q: The “resting membrane potential” of a typical neuron is primarily maintained by the:

A) Sodium-potassium pump
B) Calcium pump
C) Voltage-gated sodium channels
D) Potassium leak channels

Correct Answer: A) Sodium-potassium pump

Q: Which of the following structures connects the left and right hemispheres of the brain?

A) Corpus callosum
B) Thalamus
C) Medulla oblongata
D) Cerebellum

Correct Answer: A) Corpus callosum

Q: Which of the following is NOT a characteristic of the sympathetic nervous system?

A) It increases heart rate
B) It dilates the pupils
C) It stimulates digestion
D) It prepares the body for “fight or flight”

Correct Answer: C) It stimulates digestion

Q: Which neurotransmitter is primarily associated with the sympathetic nervous system?

A) Acetylcholine
B) Glutamate
C) Norepinephrine
D) Dopamine

Correct Answer: C) Norepinephrine

Q: What is the primary role of the autonomic nervous system?

A) To control voluntary muscle movement
B) To regulate involuntary functions such as heart rate and digestion
C) To transmit sensory information to the brain
D) To integrate motor and sensory signals

Correct Answer: B) To regulate involuntary functions such as heart rate and digestion

Q: Which of the following is responsible for the “fight or flight” response?

A) Parasympathetic nervous system
B) Somatic nervous system
C) Sympathetic nervous system
D) Central nervous system

Correct Answer: C) Sympathetic nervous system

Q: Which of the following structures is involved in memory formation?

A) Medulla oblongata
B) Hippocampus
C) Cerebellum
D) Pons

Correct Answer: B) Hippocampus

Q: The synaptic cleft is the space between which two structures?

A) Axon and dendrite
B) Dendrite and soma
C) Axon and axon terminal
D) Pre-synaptic neuron and post-synaptic neuron

Correct Answer: D) Pre-synaptic neuron and post-synaptic neuron

Q: Which of the following best describes the role of acetylcholine in the neuromuscular junction?

A) It depolarizes the muscle fiber, leading to muscle contraction
B) It inhibits muscle contraction
C) It inhibits neurotransmitter release from the motor neuron
D) It relaxes the smooth muscle

Correct Answer: A) It depolarizes the muscle fiber, leading to muscle contraction

Q: What type of glial cell is responsible for myelinating neurons in the central nervous system (CNS)?

A) Schwann cells
B) Oligodendrocytes
C) Astrocytes
D) Microglia

Correct Answer: B) Oligodendrocytes

Q: Which of the following is a primary function of the cerebellum?

A) Regulation of body temperature
B) Coordination of voluntary movements and balance
C) Processing of sensory information
D) Control of autonomic functions

Correct Answer: B) Coordination of voluntary movements and balance

Q: In which part of the brain is the primary motor cortex located?

A) Occipital lobe
B) Parietal lobe
C) Temporal lobe
D) Frontal lobe

Correct Answer: D) Frontal lobe

Q: Which of the following describes the action of a sodium-potassium pump?

A) It pumps sodium ions into the cell and potassium ions out of the cell
B) It pumps potassium ions into the cell and sodium ions out of the cell
C) It exchanges calcium ions for sodium ions
D) It is responsible for the propagation of action potentials

Correct Answer: B) It pumps potassium ions into the cell and sodium ions out of the cell

Q: What is the purpose of the blood-brain barrier?

A) To allow nutrients and gases to freely pass between the blood and the brain
B) To protect the brain from harmful substances and pathogens
C) To prevent the release of neurotransmitters
D) To allow the flow of cerebrospinal fluid

Correct Answer: B) To protect the brain from harmful substances and pathogens

Q: Which of the following is NOT a function of the hypothalamus?

A) Regulating body temperature
B) Controlling hunger and thirst
C) Synthesizing cerebrospinal fluid
D) Controlling the release of hormones from the pituitary gland

Correct Answer: C) Synthesizing cerebrospinal fluid

Q: Which of the following neurotransmitters is primarily associated with the parasympathetic nervous system?

A) Acetylcholine
B) Norepinephrine
C) Serotonin
D) Dopamine

Correct Answer: A) Acetylcholine

Q: Which of the following is true about the refractory period of an action potential?

A) During the absolute refractory period, no new action potential can be generated
B) The relative refractory period occurs when the neuron is depolarized
C) During the absolute refractory period, a second action potential can be generated if the stimulus is strong enough
D) The relative refractory period is shorter than the absolute refractory period

Correct Answer: A) During the absolute refractory period, no new action potential can be generated

Q: What is the function of the sodium-potassium pump during the action potential?

A) It causes the depolarization of the membrane
B) It restores the resting membrane potential after an action potential
C) It increases the concentration of calcium ions inside the cell
D) It triggers neurotransmitter release at the synapse

Correct Answer: B) It restores the resting membrane potential after an action potential

Q: Which of the following structures is primarily responsible for processing and integrating sensory information before it is sent to the cerebral cortex?

A) Cerebellum
B) Thalamus
C) Pons
D) Medulla oblongata

Correct Answer: B) Thalamus

Q: The myelin sheath is produced by which type of cell in the peripheral nervous system?

A) Schwann cells
B) Oligodendrocytes
C) Astrocytes
D) Microglial cells

Correct Answer: A) Schwann cells

Medical Exam Past Papers with Answers (Part-02)

Q: Which of the following is a characteristic of the parasympathetic nervous system?

A) It stimulates the “fight or flight” response
B) It increases heart rate and blood pressure
C) It conserves energy and promotes “rest and digest” functions
D) It dilates the pupils

Correct Answer: C) It conserves energy and promotes “rest and digest” functions

Q: Which ion is involved in the release of neurotransmitters from the presynaptic neuron?

A) Sodium (Na⁺)
B) Calcium (Ca²⁺)
C) Potassium (K⁺)
D) Chloride (Cl⁻)

Correct Answer: B) Calcium (Ca²⁺)

Q: Which of the following parts of the brain is primarily responsible for controlling voluntary motor movements?

A) Cerebellum
B) Medulla oblongata
C) Primary motor cortex
D) Hippocampus

Correct Answer: C) Primary motor cortex

Q: Which of the following is true about neurotransmitters?

A) They are always excitatory
B) They are synthesized and stored in the presynaptic neuron
C) They are only released during depolarization of the postsynaptic membrane
D) They are only found in the peripheral nervous system

Correct Answer: B) They are synthesized and stored in the presynaptic neuron

Q: In which part of the nervous system are the “sensory neurons” that carry information from sensory receptors located?

A) Peripheral nervous system
B) Central nervous system
C) Spinal cord only
D) Brainstem only

Correct Answer: A) Peripheral nervous system

Q: Which of the following structures is responsible for coordinating movements and maintaining balance?

A) Thalamus
B) Cerebellum
C) Pons
D) Hypothalamus

Correct Answer: B) Cerebellum

Q: What type of synapse involves the direct flow of ions between two adjacent cells?

A) Chemical synapse
B) Electrical synapse
C) Neuromuscular junction
D) Neuroendocrine synapse

Correct Answer: B) Electrical synapse

Q: Which of the following is responsible for the “fight or flight” response in the sympathetic nervous system?

A) Acetylcholine
B) Norepinephrine
C) Serotonin
D) Dopamine

Correct Answer: B) Norepinephrine

Q: What type of receptor is responsible for detecting changes in light intensity in the retina?

A) Mechanoreceptors
B) Photoreceptors
C) Thermoreceptors
D) Chemoreceptors

Correct Answer: B) Photoreceptors

Q: Which of the following best describes the action of an inhibitory postsynaptic potential (IPSP)?

A) It depolarizes the postsynaptic membrane, making it more likely to fire an action potential
B) It hyperpolarizes the postsynaptic membrane, making it less likely to fire an action potential
C) It leads to the release of acetylcholine into the synaptic cleft
D) It triggers the opening of sodium channels in the postsynaptic membrane

Correct Answer: B) It hyperpolarizes the postsynaptic membrane, making it less likely to fire an action potential

Q: Which of the following is NOT a function of the sympathetic nervous system?

A) Dilating the pupils
B) Stimulating the release of digestive enzymes
C) Increasing heart rate
D) Increasing blood flow to muscles

Correct Answer: B) Stimulating the release of digestive enzymes

Q: The blood-brain barrier is effective at blocking the passage of which of the following substances?

A) Oxygen and carbon dioxide
B) Glucose
C) Large molecules, such as proteins and some drugs
D) Water

Correct Answer: C) Large molecules, such as proteins and some drugs

Q: Which of the following ion channels is primarily responsible for the repolarization phase of an action potential?

A) Sodium channels
B) Potassium channels
C) Calcium channels
D) Chloride channels

Correct Answer: B) Potassium channels

Q: Which of the following is primarily involved in the modulation of emotional responses and behavior?

A) Amygdala
B) Hippocampus
C) Cerebellum
D) Medulla oblongata

Correct Answer: A) Amygdala

Q: Which of the following types of glial cells provide structural support and are involved in the blood-brain barrier in the CNS?

A) Microglia
B) Oligodendrocytes
C) Astrocytes
D) Schwann cells

Correct Answer: C) Astrocytes

Q: Which structure connects the brainstem to the cerebellum?

A) Pons
B) Medulla oblongata
C) Corpus callosum
D) Cerebral cortex

Correct Answer: A) Pons

Q: Which of the following is the primary function of the dorsal root ganglion?

A) It transmits motor signals to muscles
B) It processes sensory information before sending it to the brain
C) It connects the spinal cord to the peripheral nerves
D) It contains cell bodies of sensory neurons

Correct Answer: D) It contains cell bodies of sensory neurons

Q: What is the role of the blood-brain barrier in the central nervous system?

A) To allow all molecules to freely pass into the brain
B) To prevent the entry of certain pathogens and harmful substances
C) To allow glucose and oxygen to pass but block carbon dioxide
D) To facilitate rapid nerve impulse conduction

Correct Answer: B) To prevent the entry of certain pathogens and harmful substances

Q: The synaptic vesicles in a presynaptic neuron store:

A) Neurotransmitters
B) Ions
C) DNA
D) Mitochondria

Correct Answer: A) Neurotransmitters

Q: What happens during the depolarization phase of an action potential?

A) Potassium ions enter the cell
B) Sodium ions exit the cell
C) Sodium ions enter the cell
D) Chloride ions enter the cell

Correct Answer: C) Sodium ions enter the cell

Q: Which of the following cells is responsible for the production of cerebrospinal fluid (CSF)?

A) Microglia
B) Astrocytes
C) Ependymal cells
D) Schwann cells

Correct Answer: C) Ependymal cells

Q: The part of the brain that is primarily responsible for coordinating voluntary muscle movements is:

A) Pons
B) Medulla oblongata
C) Cerebellum
D) Thalamus

Correct Answer: C) Cerebellum

Q: Which of the following neurotransmitters is involved in the “fight or flight” response and is released by the adrenal medulla?

A) Norepinephrine
B) Acetylcholine
C) Dopamine
D) Serotonin

Correct Answer: A) Norepinephrine

Q: Which of the following types of receptors responds to mechanical stimuli, such as pressure or stretch?

A) Photoreceptors
B) Chemoreceptors
C) Thermoreceptors
D) Mechanoreceptors

Correct Answer: D) Mechanoreceptors

Q: Which of the following is true about the resting membrane potential of a neuron?

A) The inside of the neuron is more positively charged than the outside
B) The resting potential is maintained by the activity of voltage-gated channels
C) The sodium-potassium pump maintains a higher concentration of sodium outside the neuron
D) Potassium ions are actively transported out of the cell at rest

Correct Answer: C) The sodium-potassium pump maintains a higher concentration of sodium outside the neuron

Medical Exam Past Papers with Answers (Part-03)

Q: Which of the following statements is true regarding action potentials?

A) Action potentials are propagated with varying magnitudes depending on the stimulus strength
B) Action potentials involve the movement of sodium and potassium ions across the cell membrane
C) Once an action potential is generated, it can only travel toward the dendrites
D) Action potentials occur in the absence of ion flow across the membrane

Correct Answer: B) Action potentials involve the movement of sodium and potassium ions across the cell membrane

Q: Which part of the autonomic nervous system is responsible for stimulating digestion and promoting energy conservation?

A) Sympathetic nervous system
B) Parasympathetic nervous system
C) Central nervous system
D) Enteric nervous system

Correct Answer: B) Parasympathetic nervous system

Q: The term “neuromuscular junction” refers to the:

A) Point of communication between a motor neuron and a muscle fiber
B) Area of the spinal cord where sensory neurons enter
C) Site where sensory receptors transmit information to the CNS
D) Region where electrical impulses are generated in neurons

Correct Answer: A) Point of communication between a motor neuron and a muscle fiber

Q: Which type of glial cells are involved in the formation of the myelin sheath in the central nervous system?

A) Schwann cells
B) Oligodendrocytes
C) Astrocytes
D) Microglia

Correct Answer: B) Oligodendrocytes

Q: The action potential is said to be “all-or-nothing” because:

A) The stimulus must always be the same strength
B) Once the threshold potential is reached, the action potential occurs at full strength
C) The action potential is always the same duration
D) Only a portion of the neuron depolarizes at any given time

Correct Answer: B) Once the threshold potential is reached, the action potential occurs at full strength

Q: Which of the following ion channels is primarily responsible for the depolarization phase of an action potential in a neuron?

A) Potassium channels
B) Sodium channels
C) Chloride channels
D) Calcium channels

Correct Answer: B) Sodium channels

Q: Which region of the brain is responsible for regulating vital functions like heartbeat and breathing?

A) Cerebrum
B) Cerebellum
C) Medulla oblongata
D) Thalamus

Correct Answer: C) Medulla oblongata

Q: What role do the astrocytes play in the central nervous system?

A) They produce neurotransmitters
B) They form the blood-brain barrier and provide structural support
C) They conduct electrical impulses
D) They remove dead cells from the CNS

Correct Answer: B) They form the blood-brain barrier and provide structural support

Q: Which of the following best describes the concept of “summation” in the context of synaptic transmission?

A) The process of neurotransmitter release at a single synapse
B) The combined effect of multiple postsynaptic potentials at the same time
C) The process of reuptake of neurotransmitters by the presynaptic neuron
D) The inhibition of neurotransmitter release at the presynaptic terminal

Correct Answer: B) The combined effect of multiple postsynaptic potentials at the same time

Q: What is the function of the afferent neurons in the nervous system?

A) To transmit impulses from the CNS to the muscles
B) To transmit sensory information from receptors to the CNS
C) To integrate and process information in the CNS
D) To control autonomic functions such as heartbeat and digestion

Correct Answer: B) To transmit sensory information from receptors to the CNS

Q: The stretch reflex, such as the knee-jerk reflex, is mediated by:

A) A polysynaptic pathway
B) A simple monosynaptic pathway
C) The parasympathetic nervous system
D) The sympathetic nervous system

Correct Answer: B) A simple monosynaptic pathway

Q: Which of the following structures is responsible for relaying motor commands from the brain to the spinal cord?

A) Medulla oblongata
B) Cerebellum
C) Thalamus
D) Pons

Correct Answer: A) Medulla oblongata

Q: Which of the following statements about neurotransmitters is correct?

A) They are only synthesized in the post-synaptic neuron
B) They are stored in the cell body of the neuron
C) They are released from synaptic vesicles into the synaptic cleft
D) They cannot be degraded or recycled after release

Correct Answer: C) They are released from synaptic vesicles into the synaptic cleft

Q: What is the main function of Schwann cells in the peripheral nervous system?

A) They produce cerebrospinal fluid
B) They transmit electrical impulses
C) They form myelin sheaths around axons
D) They act as immune cells in the CNS

Correct Answer: C) They form myelin sheaths around axons

Q: What is the primary neurotransmitter used by the parasympathetic nervous system?

A) Norepinephrine
B) Acetylcholine
C) Glutamate
D) Dopamine

Correct Answer: B) Acetylcholine

Q: Which part of the nervous system controls voluntary muscle movements?

A) Autonomic nervous system
B) Central nervous system
C) Somatic nervous system
D) Enteric nervous system

Correct Answer: C) Somatic nervous system

Q: Which of the following is the role of calcium ions in neurotransmitter release?

A) Calcium ions inhibit the release of neurotransmitters
B) Calcium ions trigger the fusion of synaptic vesicles with the presynaptic membrane
C) Calcium ions help the postsynaptic neuron depolarize
D) Calcium ions are involved in the reuptake of neurotransmitters

Correct Answer: B) Calcium ions trigger the fusion of synaptic vesicles with the presynaptic membrane

Q: What happens during the hyperpolarization phase of an action potential?

A) The membrane potential becomes more negative than the resting potential
B) Sodium ions rush into the neuron
C) Potassium ions rush out of the neuron
D) The membrane potential becomes more positive than the resting potential

Correct Answer: A) The membrane potential becomes more negative than the resting potential

Q: Which structure in the brain is primarily involved in the regulation of body temperature?

A) Cerebellum
B) Thalamus
C) Hypothalamus
D) Pons

Correct Answer: C) Hypothalamus

Q: What type of receptors are involved in the detection of pain?

A) Photoreceptors
B) Nociceptors
C) Mechanoreceptors
D) Thermoreceptors

Correct Answer: B) Nociceptors

Q: Which type of ion channel is responsible for the rapid influx of sodium ions during the depolarization of a neuron?

A) Voltage-gated sodium channels
B) Ligand-gated chloride channels
C) Voltage-gated potassium channels
D) Leak potassium channels

Correct Answer: A) Voltage-gated sodium channels

Q: The primary function of the medulla oblongata includes all EXCEPT:

A) Regulation of heart rate and breathing
B) Control of reflexes such as coughing and vomiting
C) Coordination of voluntary muscle movements
D) Transmission of sensory and motor signals between the spinal cord and brain

Correct Answer: C) Coordination of voluntary muscle movements

Q: Which of the following is a function of the sympathetic nervous system?

A) Increases digestive activity
B) Promotes “rest and digest” responses
C) Stimulates “fight or flight” responses
D) Lowers heart rate and blood pressure

Correct Answer: C) Stimulates “fight or flight” responses

Q: The blood-brain barrier is formed by which of the following?

A) Endothelial cells of the capillaries
B) Microglial cells
C) Neurons in the CNS
D) Schwann cells in the PNS

Correct Answer: A) Endothelial cells of the capillaries

Q: What type of glial cells are responsible for the phagocytosis of pathogens and debris in the CNS?

A) Oligodendrocytes
B) Microglia
C) Astrocytes
D) Schwann cells

Correct Answer: B) Microglia

Medical Exam Past Papers with Answers (Part-04)

Q: Which of the following is the main function of the corpus callosum?

A) Regulates hormonal release from the pituitary
B) Connects the left and right hemispheres of the brain
C) Integrates sensory information from the body
D) Coordinates voluntary muscle movements

Correct Answer: B) Connects the left and right hemispheres of the brain

Q: Which of the following is involved in the regulation of the autonomic nervous system?

A) Pons
B) Hypothalamus
C) Cerebellum
D) Temporal lobe

Correct Answer: B) Hypothalamus

Q: Which of the following is NOT a function of astrocytes?

A) Forming the blood-brain barrier
B) Supporting neuronal metabolism
C) Myelinating axons
D) Maintaining extracellular ion balance

Correct Answer: C) Myelinating axons

Q: Which neurotransmitter is involved in the regulation of mood and is commonly associated with depression when levels are low?

A) Norepinephrine
B) Dopamine
C) Serotonin
D) Glutamate

Correct Answer: C) Serotonin

Q: The propagation of an action potential down an axon occurs in which direction?

A) From dendrites to soma to axon terminal
B) From soma to dendrites to axon
C) From axon terminal to soma to dendrites
D) From soma to axon terminal to dendrites

Correct Answer: D) From soma to axon terminal to dendrites

Q: Which part of the neuron is responsible for receiving incoming signals from other neurons?

A) Axon
B) Soma
C) Dendrites
D) Axon terminal

Correct Answer: C) Dendrites

Q: Which of the following ions is primarily responsible for the repolarization phase of an action potential?

A) Sodium (Na⁺)
B) Potassium (K⁺)
C) Calcium (Ca²⁺)
D) Chloride (Cl⁻)

Correct Answer: B) Potassium (K⁺)

Q: Which structure in the brain is involved in regulating wakefulness and the sleep-wake cycle?

A) Hippocampus
B) Thalamus
C) Pineal gland
D) Reticular formation

Correct Answer: D) Reticular formation

Q: Which of the following best describes the function of the hypothalamus in the nervous system?

A) It controls motor movements and balance
B) It regulates autonomic functions such as temperature and hunger
C) It relays sensory information to the cortex
D) It is involved in language comprehension

Correct Answer: B) It regulates autonomic functions such as temperature and hunger

Q: In which part of the neuron does synaptic transmission primarily occur?

A) Axon
B) Dendrites
C) Axon terminal
D) Soma

Correct Answer: C) Axon terminal

Q: Which type of glial cell forms the myelin sheath in the peripheral nervous system?

A) Oligodendrocytes
B) Schwann cells
C) Astrocytes
D) Microglia

Correct Answer: B) Schwann cells

Q: The action potential is initiated when the membrane potential reaches:

A) The threshold potential
B) The resting potential
C) The hyperpolarization potential
D) The equilibrium potential

Correct Answer: A) The threshold potential

Q: Which of the following types of cells are responsible for myelinating axons in the central nervous system?

A) Schwann cells
B) Oligodendrocytes
C) Microglia
D) Astrocytes

Correct Answer: B) Oligodendrocytes

Q: Which of the following neurotransmitters is primarily involved in the transmission of pain signals?

A) Serotonin
B) Acetylcholine
C) Glutamate
D) Substance P

Correct Answer: D) Substance P

Q: Which of the following ion channels are responsible for the rapid depolarization phase of an action potential?

A) Potassium channels
B) Sodium channels
C) Calcium channels
D) Chloride channels

Correct Answer: B) Sodium channels

Q: What is the primary role of the cerebellum in motor control?

A) To initiate voluntary movements
B) To coordinate and fine-tune voluntary movements
C) To process sensory information
D) To control the autonomic functions

Correct Answer: B) To coordinate and fine-tune voluntary movements

Q: Which of the following components of the nervous system is responsible for voluntary control of skeletal muscles?

A) Autonomic nervous system
B) Somatic nervous system
C) Central nervous system
D) Enteric nervous system

Correct Answer: B) Somatic nervous system

Q: Which of the following parts of the brain is responsible for regulating basic vital functions like heart rate and breathing?

A) Cerebrum
B) Cerebellum
C) Pons
D) Medulla oblongata

Correct Answer: D) Medulla oblongata

Q: The depolarization phase of an action potential is primarily caused by the influx of which ion?

A) Sodium (Na⁺)
B) Potassium (K⁺)
C) Calcium (Ca²⁺)
D) Chloride (Cl⁻)

Correct Answer: A) Sodium (Na⁺)

Q: Which part of the brain is primarily involved in processing visual information?

A) Temporal lobe
B) Occipital lobe
C) Parietal lobe
D) Frontal lobe

Correct Answer: B) Occipital lobe

Q: Which of the following is true about the sympathetic nervous system?

A) It promotes “rest and digest” activities
B) It is responsible for the “fight or flight” response
C) It decreases heart rate
D) It inhibits the release of adrenaline

Correct Answer: B) It is responsible for the “fight or flight” response

Q: Which of the following ions plays a key role in neurotransmitter release at the synaptic cleft?

A) Potassium (K⁺)
B) Sodium (Na⁺)
C) Calcium (Ca²⁺)
D) Magnesium (Mg²⁺)

Correct Answer: C) Calcium (Ca²⁺)

Q: The function of the autonomic nervous system is primarily controlled by which brain structure?

A) Thalamus
B) Pons
C) Hypothalamus
D) Cerebellum

Correct Answer: C) Hypothalamus

Q: Which of the following is true about the action of neurotransmitters at the synaptic cleft?

A) They always inhibit the postsynaptic neuron
B) They bind to receptors on the postsynaptic membrane
C) They are stored in the postsynaptic neuron
D) They are produced by the postsynaptic neuron

Correct Answer: B) They bind to receptors on the postsynaptic membrane

Q: Which of the following functions is associated with the frontal lobe of the brain?

A) Visual processing
B) Motor control and higher cognitive functions
C) Auditory processing
D) Memory formation

Correct Answer: B) Motor control and higher cognitive functions

Medical Exam Past Papers with Answers (Part-05)

Q: The action potential travels down the length of an axon via which mechanism?

A) Saltatory conduction
B) Graded potential
C) Axonal transport
D) Retrograde signaling

Correct Answer: A) Saltatory conduction

Q: Which of the following neurotransmitters is primarily involved in the reward system and motivation?

A) Acetylcholine
B) Dopamine
C) Norepinephrine
D) Glutamate

Correct Answer: B) Dopamine

Q: What is the primary function of the node of Ranvier in a myelinated axon?

A) To generate action potentials
B) To increase the speed of signal transmission through saltatory conduction
C) To synthesize neurotransmitters
D) To regulate the sodium-potassium pump

Correct Answer: B) To increase the speed of signal transmission through saltatory conduction

Q: Which of the following is the primary effect of the parasympathetic nervous system?

A) Increased heart rate
B) Increased digestive activity
C) Pupil dilation
D) Increased sweating

Correct Answer: B) Increased digestive activity

Q: Which of the following is NOT true about the sympathetic nervous system?

A) It prepares the body for “fight or flight”
B) It increases blood flow to skeletal muscles
C) It stimulates salivation and digestion
D) It inhibits digestive activity

Correct Answer: C) It stimulates salivation and digestion

Q: Which ion is responsible for the release of neurotransmitters at the synaptic cleft?

A) Sodium (Na⁺)
B) Calcium (Ca²⁺)
C) Potassium (K⁺)
D) Magnesium (Mg²⁺)

Correct Answer: B) Calcium (Ca²⁺)

Q: In a typical synapse, the neurotransmitter is released into the synaptic cleft from:

A) The dendrites of the presynaptic neuron
B) The axon terminal of the presynaptic neuron
C) The soma of the presynaptic neuron
D) The axon of the postsynaptic neuron

Correct Answer: B) The axon terminal of the presynaptic neuron

Q: The blood-brain barrier is least permeable to which of the following substances?

A) Glucose
B) Oxygen
C) Water
D) Large, water-soluble molecules

Correct Answer: D) Large, water-soluble molecules

Q: Which of the following ions is primarily responsible for the repolarization phase of the action potential?

A) Sodium (Na⁺)
B) Calcium (Ca²⁺)
C) Potassium (K⁺)
D) Chloride (Cl⁻)

Correct Answer: C) Potassium (K⁺)

Q: What is the function of the myelin sheath around an axon?

A) To increase the speed of action potential transmission
B) To increase the number of neurotransmitter receptors
C) To synthesize proteins in the axon
D) To help regenerate damaged neurons

Correct Answer: A) To increase the speed of action potential transmission

Q: Which of the following structures is responsible for the maintenance of the blood-brain barrier?

A) Astrocytes
B) Microglia
C) Ependymal cells
D) Schwann cells

Correct Answer: A) Astrocytes

Q: Which part of the nervous system is responsible for controlling involuntary functions such as heart rate and digestion?

A) Central nervous system
B) Somatic nervous system
C) Autonomic nervous system
D) Peripheral nervous system

Correct Answer: C) Autonomic nervous system

Q: What is the function of the sodium-potassium pump in neurons?

A) To transport neurotransmitters into the synaptic vesicles
B) To move sodium and potassium ions against their concentration gradients
C) To generate action potentials
D) To remove waste products from the synaptic cleft

Correct Answer: B) To move sodium and potassium ions against their concentration gradients

Q: Which part of the brain is primarily responsible for regulating emotional responses and memory?

A) Cerebellum
B) Hippocampus
C) Thalamus
D) Brainstem

Correct Answer: B) Hippocampus

Q: Which neurotransmitter is involved in the inhibition of pain transmission in the central nervous system?

A) Norepinephrine
B) Endorphins
C) Glutamate
D) Acetylcholine

Correct Answer: B) Endorphins

Q: The primary role of the temporal lobe is in:

A) Visual processing
B) Memory and auditory processing
C) Motor control
D) Sensory processing

Correct Answer: B) Memory and auditory processing

Q: Which part of the brain is involved in the coordination of motor movements and balance?

A) Cerebrum
B) Cerebellum
C) Thalamus
D) Medulla oblongata

Correct Answer: B) Cerebellum

Q: Which type of glial cells act as the immune cells of the central nervous system?

A) Oligodendrocytes
B) Astrocytes
C) Microglia
D) Schwann cells

Correct Answer: C) Microglia

Q: Which of the following neurotransmitters is primarily involved in the fight-or-flight response and stress adaptation?

A) Dopamine
B) Acetylcholine
C) Norepinephrine
D) Serotonin

Correct Answer: C) Norepinephrine

Q: Which type of receptors respond to light stimuli in the eye?

A) Thermoreceptors
B) Nociceptors
C) Photoreceptors
D) Mechanoreceptors

Correct Answer: C) Photoreceptors

Q: What is the function of the axon hillock in a neuron?

A) To synthesize proteins for the neuron
B) To integrate incoming signals and generate action potentials
C) To release neurotransmitters
D) To maintain the blood-brain barrier

Correct Answer: B) To integrate incoming signals and generate action potentials

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