Neuroscience: Brain & Behaviour Exam 2026: Comprehensive
University/Graduate Practice Examination — Neuroanatomy, Neural
Signalling, Sensory & Motor Systems, Cognition, Emotion, Learning,
Memory, Behaviour & Clinical Neuroscience — 190 Multiple-Choice
Questions with Answers & Detailed Rationales
SECTION 1: NEURONAL STRUCTURE, FUNCTION, AND SIGNALING (Questions 1–30)
Question 1
Which component of the neuron is primarily responsible for receiving synaptic inputs from
other neurons?
A. Axon hillock
B. Dendritic tree
C. Axon terminal
D. Myelin sheath
Correct Answer: B
Explanation: Dendrites are branched extensions that receive synaptic signals, converting
chemical messages into graded electrical potentials that propagate toward the soma.
Question 2
A researcher blocks voltage-gated sodium channels in a cultured neuron. Which phase of the
action potential will be most directly eliminated?
A. Resting membrane potential
B. Depolarization phase
C. Repolarization phase
,D. Hyperpolarization phase
Correct Answer: B
Explanation: Voltage-gated Na⁺ channels mediate the rapid influx of sodium ions that drives
the depolarization phase of the action potential.
Question 3
Which glial cell type is responsible for forming the blood-brain barrier?
A. Microglia
B. Oligodendrocytes
C. Astrocytes
D. Ependymal cells
Correct Answer: C
Explanation: Astrocytic end-feet wrap around capillaries and induce tight junctions, forming
the blood-brain barrier that regulates CNS homeostasis.
Question 4
During which period is an action potential impossible to initiate regardless of stimulus
strength?
A. Relative refractory period
B. Absolute refractory period
C. Resting state
D. Threshold potential
,Correct Answer: B
Explanation: During the absolute refractory period, voltage-gated Na⁺ channels are
inactivated, preventing any new action potential from being generated.
Question 5
Saltatory conduction in myelinated axons primarily serves to:
A. Increase membrane capacitance
B. Decrease conduction velocity
C. Increase conduction velocity and conserve energy
D. Eliminate the need for ion channels
Correct Answer: C
Explanation: Myelin forces action potentials to jump between nodes of Ranvier, increasing
speed and reducing ATP expenditure on ion pumping.
Question 6
A patient presents with muscle weakness and sensory loss. Nerve conduction studies reveal
slowed conduction. Which structure is most likely compromised?
A. Dendritic spines
B. Myelin sheath
C. Synaptic vesicles
D. Neurotransmitter receptors
Correct Answer: B
, Explanation: Demyelination slows or blocks conduction, producing weakness and sensory
deficits characteristic of demyelinating neuropathies.
Question 7
Which ion is primarily responsible for the resting membrane potential of a typical neuron?
A. Sodium (Na⁺)
B. Calcium (Ca²⁺)
C. Potassium (K⁺)
D. Chloride (Cl⁻)
Correct Answer: C
Explanation: The resting potential is largely determined by K⁺ permeability and the
concentration gradient maintained by the Na⁺/K⁺ ATPase.
Question 8
What is the primary function of the axon hillock?
A. Release neurotransmitters
B. Integrate synaptic potentials and initiate action potentials
C. Synthesize proteins
D. Store calcium ions
Correct Answer: B
Explanation: The axon hillock sums excitatory and inhibitory postsynaptic potentials; if
threshold is reached, an action potential initiates.
University/Graduate Practice Examination — Neuroanatomy, Neural
Signalling, Sensory & Motor Systems, Cognition, Emotion, Learning,
Memory, Behaviour & Clinical Neuroscience — 190 Multiple-Choice
Questions with Answers & Detailed Rationales
SECTION 1: NEURONAL STRUCTURE, FUNCTION, AND SIGNALING (Questions 1–30)
Question 1
Which component of the neuron is primarily responsible for receiving synaptic inputs from
other neurons?
A. Axon hillock
B. Dendritic tree
C. Axon terminal
D. Myelin sheath
Correct Answer: B
Explanation: Dendrites are branched extensions that receive synaptic signals, converting
chemical messages into graded electrical potentials that propagate toward the soma.
Question 2
A researcher blocks voltage-gated sodium channels in a cultured neuron. Which phase of the
action potential will be most directly eliminated?
A. Resting membrane potential
B. Depolarization phase
C. Repolarization phase
,D. Hyperpolarization phase
Correct Answer: B
Explanation: Voltage-gated Na⁺ channels mediate the rapid influx of sodium ions that drives
the depolarization phase of the action potential.
Question 3
Which glial cell type is responsible for forming the blood-brain barrier?
A. Microglia
B. Oligodendrocytes
C. Astrocytes
D. Ependymal cells
Correct Answer: C
Explanation: Astrocytic end-feet wrap around capillaries and induce tight junctions, forming
the blood-brain barrier that regulates CNS homeostasis.
Question 4
During which period is an action potential impossible to initiate regardless of stimulus
strength?
A. Relative refractory period
B. Absolute refractory period
C. Resting state
D. Threshold potential
,Correct Answer: B
Explanation: During the absolute refractory period, voltage-gated Na⁺ channels are
inactivated, preventing any new action potential from being generated.
Question 5
Saltatory conduction in myelinated axons primarily serves to:
A. Increase membrane capacitance
B. Decrease conduction velocity
C. Increase conduction velocity and conserve energy
D. Eliminate the need for ion channels
Correct Answer: C
Explanation: Myelin forces action potentials to jump between nodes of Ranvier, increasing
speed and reducing ATP expenditure on ion pumping.
Question 6
A patient presents with muscle weakness and sensory loss. Nerve conduction studies reveal
slowed conduction. Which structure is most likely compromised?
A. Dendritic spines
B. Myelin sheath
C. Synaptic vesicles
D. Neurotransmitter receptors
Correct Answer: B
, Explanation: Demyelination slows or blocks conduction, producing weakness and sensory
deficits characteristic of demyelinating neuropathies.
Question 7
Which ion is primarily responsible for the resting membrane potential of a typical neuron?
A. Sodium (Na⁺)
B. Calcium (Ca²⁺)
C. Potassium (K⁺)
D. Chloride (Cl⁻)
Correct Answer: C
Explanation: The resting potential is largely determined by K⁺ permeability and the
concentration gradient maintained by the Na⁺/K⁺ ATPase.
Question 8
What is the primary function of the axon hillock?
A. Release neurotransmitters
B. Integrate synaptic potentials and initiate action potentials
C. Synthesize proteins
D. Store calcium ions
Correct Answer: B
Explanation: The axon hillock sums excitatory and inhibitory postsynaptic potentials; if
threshold is reached, an action potential initiates.
