Question 1

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

Accepted Answer

To protect the brain by selectively allowing certain substances to pass while blocking others

Question 2

A patient suffers a spinal cord injury that damages the right lateral corticospinal tract at the level of the cervical spinal cord. Which of the following deficits would most likely be observed?

Accepted Answer

Loss of voluntary movement on the right side of the body below the injury

Question 3

Which of the following best explains why myelinated axons conduct action potentials faster than unmyelinated axons?

Accepted Answer

Myelination allows for saltatory conduction, where action potentials jump between nodes of Ranvier

Question 4

Which neurotransmitter is the most common excitatory neurotransmitter in the central nervous system?

Accepted Answer

Glutamate

Question 5

A patient presents with loss of pain and temperature sensation on the left side of the body below the waist, but touch and proprioception are intact. Which spinal cord tract is most likely damaged?

Accepted Answer

Right lateral spinothalamic tract

Question 6

Which of the following best describes the difference between the somatic and autonomic motor divisions of the peripheral nervous system?

Accepted Answer

The somatic division controls voluntary skeletal muscles, while the autonomic division controls involuntary smooth and cardiac muscles

Question 7

Which of the following is a function of astrocytes in the central nervous system?

Accepted Answer

Maintaining the blood-brain barrier and regulating the extracellular environment

Question 8

During an action potential, which event is responsible for the rapid depolarization phase?

Accepted Answer

Opening of voltage-gated sodium channels

Question 9

Which of the following best describes the role of the corpus callosum?

Accepted Answer

It connects the two cerebral hemispheres, allowing communication between them

Question 10

Which of the following equations correctly represents the Nernst equation for calculating the equilibrium potential for a single ion?

Accepted Answer

$$E_{ion} = \frac{RT}{zF} \ln \left( \frac{[ion]_{out}}{[ion]_{in}} \right)$$

Question 11

Which of the following best explains why a neurotransmitter can be excitatory at one synapse and inhibitory at another?

Accepted Answer

The effect depends on the type of receptor present on the postsynaptic cell

Question 12

Which of the following is a correct sequence of events in chemical synaptic transmission?

Accepted Answer

Action potential arrives at axon terminal → Voltage-gated calcium channels open → Neurotransmitter released → Neurotransmitter binds to postsynaptic receptors

Question 13

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

Accepted Answer

Regulation of sleep, arousal, and consciousness

Question 14

Which of the following cranial nerves is responsible for the sense of smell?

Accepted Answer

Olfactory nerve (I)

Question 15

Which of the following statements about the sympathetic and parasympathetic divisions of the autonomic nervous system is correct?

Accepted Answer

The sympathetic division generally increases heart rate, while the parasympathetic division generally decreases heart rate

Question 16

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

Accepted Answer

Coordination and fine-tuning of voluntary movements

Question 17

Which of the following is a characteristic of a monosynaptic reflex arc?

Accepted Answer

It involves only one synapse between a sensory and a motor neuron

Question 18

Which of the following best explains the concept of decussation in sensory and motor pathways?

Accepted Answer

It refers to the crossing of nerve fibers from one side of the CNS to the other

Question 19

Which of the following is a function of cerebrospinal fluid (CSF)?

Accepted Answer

Providing buoyancy and protection for the brain and spinal cord

Question 20

Which of the following best describes the difference between temporal and spatial summation at a chemical synapse?

Accepted Answer

Temporal summation involves one synapse firing repeatedly in quick succession, while spatial summation involves multiple synapses firing at the same time

Study Guide: Nervous System and Its Divisions (ANP Chapters 11-14)

Study Guide - Practice Questions

Study Guide - Flashcards