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

Question 1

Which of the following best describes the primary function of myelination in neurons?

Accepted Answer

To speed up the propagation of action potentials along the axon

Question 2

A patient presents with loss of fine motor control and difficulty with balance. Which part of the brain is most likely affected?

Accepted Answer

Cerebellum

Question 3

During the generation of an action potential, which ion channel opens first and what is the resulting effect on membrane potential?

Accepted Answer

Sodium channels open, causing depolarization

Question 4

Which equation correctly represents the Nernst equation for calculating the equilibrium potential of an ion?

Accepted Answer

$$E = \frac{RT}{zF} \ln \left( \frac{[	ext{ion}]_{	ext{out}}}{[	ext{ion}]_{	ext{in}}} ight)$$

Question 5

Which of the following best explains why the refractory period prevents the backward propagation of an action potential?

Accepted Answer

Voltage-gated sodium channels are inactivated and cannot reopen immediately

Question 6

A patient is unable to regulate body temperature and experiences disruptions in hunger and thirst. Which brain structure is most likely damaged?

Accepted Answer

Hypothalamus

Question 7

Which of the following is TRUE regarding graded potentials?

Accepted Answer

They decrease in magnitude as they spread from the site of stimulation

Question 8

Which of the following best describes the role of the sodium-potassium pump in maintaining the resting membrane potential?

Accepted Answer

It pumps 3 sodium ions out and 2 potassium ions in per ATP hydrolyzed

Question 9

Which of the following is NOT a function of the thalamus?

Accepted Answer

Coordination of voluntary muscle movement

Question 10

A patient has difficulty forming new memories after a traumatic brain injury. Which brain region is most likely affected?

Accepted Answer

Hippocampus

Question 11

Which of the following best describes the difference between the central nervous system (CNS) and the peripheral nervous system (PNS)?

Accepted Answer

The CNS consists of the brain and spinal cord, while the PNS includes all neural tissue outside the CNS

Question 12

Which of the following is a correct sequence of events during synaptic transmission at a chemical synapse?

Accepted Answer

Action potential arrival, calcium influx, neurotransmitter release

Question 13

Which equation best represents Ohm's Law as applied to membrane potential?

Accepted Answer

$$V = I \cdot R$$

Question 14

Which of the following best explains the concept of summation in postsynaptic potentials?

Accepted Answer

Summation is the process by which multiple graded potentials combine to reach threshold

Question 15

Which of the following structures is responsible for the blood-brain barrier?

Accepted Answer

Astrocytes

Question 16

A patient is unable to perceive pain and temperature on the left side of the body after a spinal cord injury. Which tract is most likely damaged?

Accepted Answer

Spinothalamic tract

Question 17

Which of the following is TRUE regarding the propagation of an action potential along a myelinated axon?

Accepted Answer

The action potential jumps from one node of Ranvier to the next (saltatory conduction)

Question 18

Which of the following best describes the function of the medulla oblongata?

Accepted Answer

Control of autonomic functions such as heart rate and respiration

Question 19

Which of the following is a correct description of the function of the corpus callosum?

Accepted Answer

It connects the two cerebral hemispheres and allows communication between them

Question 20

Which of the following is NOT one of the five basic taste sensations?

Accepted Answer

Spicy

Nervous System: Structure, Function, and Physiology Study Guide

Study Guide - Practice Questions