Question 1

Which of the following best describes the sequence of events in a typical reflex arc?

Accepted Answer

Receptor → Sensory neuron → Integration center → Motor neuron → Effector

Question 2

A patient presents with muscle weakness and slowed nerve conduction velocity. Demyelination is suspected. Which cells are most likely affected if the damage is in the peripheral nervous system (PNS)?

Accepted Answer

Schwann cells

Question 3

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

Accepted Answer

Myelinated axons allow for saltatory conduction, where action potentials jump between nodes of Ranvier.

Question 4

Which equation correctly represents the Nernst equation for calculating the equilibrium potential ($$E_{ion}) $$for a monovalent ion across a membrane?

Accepted Answer

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

Question 5

A neurotransmitter binds to a postsynaptic receptor and causes an influx of $$Cl^-$$ ions. What is the most likely effect on the postsynaptic neuron?

Accepted Answer

It will generate an inhibitory postsynaptic potential (IPSP).

Question 6

Which of the following best describes the difference between temporal and spatial summation in neurons?

Accepted Answer

Temporal summation involves one synapse firing rapidly in succession; spatial summation involves multiple synapses firing at the same time.

Question 7

A patient has a stroke affecting the left primary motor cortex. Which of the following symptoms is most likely?

Accepted Answer

Paralysis of muscles on the right side of the body

Question 8

Which of the following is a function of the thalamus?

Accepted Answer

Relay of sensory information to the cerebral cortex

Question 9

Which of the following best describes the role of the blood-brain barrier?

Accepted Answer

It selectively restricts passage of certain substances from the blood into the brain.

Question 10

Which of the following best explains why rods are more sensitive to low light than cones?

Accepted Answer

Rods contain the pigment rhodopsin, which is highly sensitive to light.

Question 11

A person is unable to recognize faces but can identify objects. Which brain area is most likely damaged?

Accepted Answer

Posterior association area (including the fusiform gyrus)

Question 12

Which cranial nerve is primarily responsible for hearing and balance?

Accepted Answer

Vestibulocochlear nerve (VIII)

Question 13

Which of the following best describes the function of the otolithic membrane in the vestibular system?

Accepted Answer

Detects linear acceleration and head position relative to gravity

Question 14

Which neurotransmitter is classified as a biogenic amine and is involved in mood regulation?

Accepted Answer

Serotonin

Question 15

A patient has difficulty forming new long-term memories after a head injury. Which brain structure is most likely damaged?

Accepted Answer

Hippocampus

Question 16

Which of the following best describes the difference between direct and indirect neurotransmitter action?

Accepted Answer

Direct action involves neurotransmitters binding to and opening ion channels; indirect action involves second messengers.

Question 17

Which of the following best explains why the Na-K pump is essential for maintaining the resting membrane potential?

Accepted Answer

It actively transports 3 Na$$^+$$ out and 2 K$$^+ in$$, maintaining the negative resting potential.

Question 18

Which of the following is true regarding the adaptation of sensory receptors?

Accepted Answer

Mechanoreceptors can be either rapidly or slowly adapting.

Question 19

Which of the following best describes the pathway of light through the retina?

Accepted Answer

Photoreceptors → Bipolar cells → Ganglion cells → Optic nerve

Question 20

Which of the following best explains why damage to the medulla oblongata can be life-threatening?

Accepted Answer

It regulates vital autonomic functions such as heart rate and breathing.

Fundamentals of the Nervous System, Central Nervous System, and Special Senses: Study Guide

Study Guide - Practice Questions

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