Question 1

Which of the following best describes the primary function of the blood-brain barrier?

Accepted Answer

To protect the brain from harmful substances by regulating what enters from the bloodstream.

Question 2

A patient suffers a stroke affecting the frontal lobe of the cerebral hemisphere. Which function is most likely to be impaired?

Accepted Answer

Initiating voluntary motor movements and decision making.

Question 3

Which equation best represents the process of sensory adaptation in the CNS, where the response to a constant stimulus decreases over time?

Accepted Answer

$$R(t) = R_0$ \cdot e$$^{-kt}$$

Question 4

Which of the following structures is NOT part of the limbic system?

Accepted Answer

Cerebellum

Question 5

A patient has damage to the Broca's area in the left cerebral hemisphere. What deficit would most likely result?

Accepted Answer

Difficulty producing coherent speech.

Question 6

Which of the following best explains the difference between ascending and descending tracts in the spinal cord?

Accepted Answer

Ascending tracts carry sensory information to the brain, while descending tracts carry motor commands from the brain to the body.

Question 7

Which region of the brain is primarily responsible for consolidating long-term memories?

Accepted Answer

Hippocampus

Question 8

If the blood-brain barrier is compromised, which of the following is a likely consequence?

Accepted Answer

Increased risk of infection and exposure to toxins in the brain.

Question 9

Which equation best describes the relationship between the rate of neurotransmitter reuptake ($$R) $$and the concentration of neurotransmitter ($$[NT]) in $$the synaptic cleft, assuming first-order kinetics?

Accepted Answer

$$R = k \cdot [NT]$$

Question 10

Which of the following best describes the role of the reticular formation?

Accepted Answer

Controls the sleep-wake cycle and levels of consciousness.

Question 11

A patient with a spinal cord injury loses sensation below the level of injury but retains motor function. Which tract is most likely affected?

Accepted Answer

Ascending sensory tract

Question 12

Which of the following is a correct sequence for the order of neurons in a sensory pathway?

Accepted Answer

First-order neuron → Second-order neuron → Third-order neuron

Question 13

Which of the following best explains cerebral hemispheric specialization?

Accepted Answer

Each hemisphere is specialized for certain functions, such as language in the left and spatial abilities in the right.

Question 14

Which equation would you use to estimate the conduction velocity ($$v) of a $$myelinated axon, given the axon diameter ($$d) $$and a proportionality constant ($$k$$)?

Accepted Answer

$$v = k \cdot d$$

Question 15

Which of the following is a function of the basal nuclei in voluntary movement?

Accepted Answer

Initiating and regulating voluntary motor commands.

Question 16

A patient is unable to recall recent events but can remember events from years ago. Which part of the brain is most likely affected?

Accepted Answer

Hippocampus

Question 17

Which of the following best describes the difference between the endocrine and nervous systems in maintaining homeostasis?

Accepted Answer

The endocrine system uses hormones for slower, long-lasting responses, while the nervous system uses electrical signals for rapid, short-term responses.

Question 18

Which of the following is a function of the thalamus?

Accepted Answer

Relaying sensory information to the cerebral cortex.

Question 19

Which of the following best explains how decussation affects motor pathways in the CNS?

Accepted Answer

Motor commands from one hemisphere cross over to control muscles on the opposite side of the body.

Question 20

Which of the following best describes the function of the cerebellum?

Accepted Answer

Coordinating balance, posture, and fine motor movements.

Central Nervous System: Structure, Function, and Integration in Anatomy & Physiology

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