,1. Which structure is responsible for the production of
cerebrospinal fluid (CSF)?
A. Choroid plexus
B. Arachnoid villi
C. Pia mater
D. Dura mater
Correct Answer: A. Choroid plexus
Rationale: The choroid plexus is a network of cells that
line the ventricles of the brain and produce CSF.
2. The blood-brain barrier (BBB) is selectively permeable
due to the presence of:
A. Astrocyte end-feet
B. Microglial cells
C. Oligodendrocytes
D. Neuronal axons
Correct Answer: A. Astrocyte end-feet
Rationale: Astrocyte end-feet contribute to the BBB's
selective permeability by forming tight junctions with
endothelial cells.
3. Which ion channel is primarily responsible for the
initiation of action potentials in neurons?
A. Potassium channels
B. Sodium channels
C. Calcium channels
D. Chloride channels
Correct Answer: B. Sodium channels
Rationale: Voltage-gated sodium channels open in
response to membrane depolarization, initiating the action
potential.
, 4. The autonomic nervous system can be divided into the
sympathetic and parasympathetic systems. Which
neurotransmitter is commonly associated with the
parasympathetic system?
A. Norepinephrine
B. Acetylcholine
C. Dopamine
D. Serotonin
Correct Answer: B. Acetylcholine
Rationale: Acetylcholine is the primary neurotransmitter of
the parasympathetic nervous system, promoting rest-and-
digest functions.
5. In the context of neural circuitry, what is a 'reverberating
circuit'?
A. A circuit where the signal travels in one direction only.
B. A circuit where the signal is amplified.
C. A circuit that involves feedback to earlier neurons.
D. A circuit that connects sensory and motor neurons.
Correct Answer: C. A circuit that involves feedback to
earlier neurons.
Rationale: A reverberating circuit is a neural network in
which activity circulates in a loop, allowing for prolonged
activation of the neurons.
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