Question 1

A patient suffers a stroke that damages the left frontal lobe, specifically Broca's area. Which of the following symptoms is most likely to result from this injury?

Accepted Answer

Difficulty producing coherent speech, while comprehension remains relatively intact

Question 2

Which of the following best describes the role of the sodium-potassium pump ($$\mathrm{Na^+/K^+}$$ ATPase) in maintaining the resting membrane potential of a neuron?

Accepted Answer

It actively transports $$3\ \mathrm{Na^+}$$ out of the cell and $$2\ \mathrm{K^+}$$ into the cell, maintaining a negative resting membrane potential.

Question 3

A person touches a hot stove and immediately withdraws their hand. Which of the following correctly lists the sequence of components in the reflex arc involved in this response?

Accepted Answer

Receptor → Sensory neuron → CNS integration center → Motor neuron → Effector

Question 4

Which of the following statements about myelination is correct?

Accepted Answer

Myelination increases the speed of action potential conduction by enabling saltatory conduction.

Question 5

A patient with multiple sclerosis (MS) experiences muscle weakness and vision problems. Which of the following best explains how MS leads to these symptoms?

Accepted Answer

Autoimmune attack on oligodendrocytes in the CNS leads to demyelination, slowing or blocking nerve impulse conduction.

Question 6

Which of the following best distinguishes the function of the thalamus within the diencephalon?

Accepted Answer

It serves as the main relay station for sensory information traveling to the cerebral cortex.

Question 7

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

Accepted Answer

Opening of voltage-gated $$\mathrm{Na^+}$$ channels and influx of $$\mathrm{Na^+}$$ ions

Question 8

Which of the following scenarios best illustrates spatial summation at a postsynaptic neuron?

Accepted Answer

Multiple presynaptic neurons fire simultaneously, each releasing neurotransmitter that generates EPSPs on the same postsynaptic neuron.

Question 9

Which of the following is a key difference between ionotropic and metabotropic neurotransmitter receptors?

Accepted Answer

Ionotropic receptors function as ligand-gated ion channels, producing rapid responses, while metabotropic receptors activate intracellular signaling pathways for slower, longer-lasting effects.

Question 10

A neuron receives both excitatory and inhibitory inputs. Which of the following best describes how the neuron determines whether to fire an action potential?

Accepted Answer

The neuron fires an action potential if the sum of EPSPs and IPSPs at the axon hillock reaches threshold.

Question 11

Which of the following best explains why action potentials travel in only one direction along an axon?

Accepted Answer

The absolute refractory period prevents the region of membrane that just fired from immediately generating another action potential.

Question 12

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

Accepted Answer

Maintaining the extracellular environment and supporting neurons

Question 13

A local anesthetic is applied to a region of skin. Which of the following best describes how this anesthetic prevents the sensation of pain?

Accepted Answer

It blocks voltage-gated $$\mathrm{Na^+}$$ channels, preventing action potentials in sensory neurons.

Question 14

Which of the following best describes the difference between the sympathetic and parasympathetic divisions of the autonomic nervous system?

Accepted Answer

The sympathetic division increases heart rate and dilates pupils, while the parasympathetic division decreases heart rate and promotes digestion.

Question 15

Which of the following is true regarding the effect of neurotransmitters at a synapse?

Accepted Answer

A neurotransmitter can be excitatory at one synapse and inhibitory at another, depending on the receptor present.

Question 16

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

Accepted Answer

Processing and formation of new memories

Question 17

Which of the following is a characteristic of saltatory conduction?

Accepted Answer

Action potentials 'jump' from one node of Ranvier to the next, increasing conduction speed.

Question 18

Which of the following best describes the role of microglia in the central nervous system?

Accepted Answer

They act as immune defense cells, removing debris and pathogens.

Question 19

A neuron has a large diameter and is heavily myelinated. Which of the following best predicts its conduction velocity compared to a small, unmyelinated neuron?

Accepted Answer

It will conduct impulses more rapidly due to decreased resistance and saltatory conduction.

Question 20

Which of the following is the correct structural classification for a neuron with one axon and multiple dendrites?

Accepted Answer

Multipolar neuron

Comprehensive Study Guide: Nervous System Organization and Function

Study Guide - Practice Questions

Study Guide - Flashcards