Q: Which equation best represents the Nernst equation for calculating the equilibrium potential for a single ion?

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

Question 1

Which of the following best describes the integrative function of the nervous system?

Accepted Answer

Processing and interpreting sensory input to determine an appropriate response

Question 2

Which structural division of the nervous system is responsible for carrying information from the central nervous system to effectors such as muscles and glands?

Accepted Answer

Motor (efferent) division

Question 3

Which part of a neuron is primarily responsible for receiving incoming signals from other neurons?

Accepted Answer

Dendrite

Question 4

A neuron with one axon and one dendrite extending from opposite sides of the cell body is classified as:

Accepted Answer

Bipolar

Question 5

Which type of neuroglia forms the myelin sheath in the central nervous system?

Accepted Answer

Oligodendrocytes

Question 6

What is the main function of the myelin sheath?

Accepted Answer

To increase the speed of nerve impulse conduction

Question 7

Which of the following correctly differentiates a nucleus from a ganglion?

Accepted Answer

A nucleus is a cluster of neuron cell bodies in the CNS, while a ganglion is in the PNS

Question 8

Which type of membrane ion channel opens in response to a change in membrane potential?

Accepted Answer

Voltage-gated channel

Question 9

The resting membrane potential of a typical neuron is approximately:

Accepted Answer

$$-70\ \mathrm{mV}$$

Question 10

Which of the following best describes a graded potential?

Accepted Answer

A local change in membrane potential that varies in magnitude and decays with distance

Question 11

Which of the following is a key difference between graded potentials and action potentials?

Accepted Answer

Graded potentials decay with distance, while action potentials do not

Question 12

During the generation of an action potential, which event occurs first?

Accepted Answer

Sodium channels open, causing depolarization

Question 13

The absolute refractory period is defined as:

Accepted Answer

The period when no stimulus, no matter how strong, can initiate another action potential

Question 14

Saltatory conduction is characterized by:

Accepted Answer

Action potentials jumping from one node of Ranvier to the next

Question 15

A patient with multiple sclerosis experiences muscle weakness due to demyelination. Which process is most directly affected?

Accepted Answer

Saltatory conduction of action potentials

Question 16

Which equation best represents the Nernst equation for calculating the equilibrium potential for a single ion?

Accepted Answer

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

Question 17

Which of the following is an example of a ligand-gated ion channel in neurons?

Accepted Answer

Acetylcholine receptor at the neuromuscular junction

Question 18

A tract in the nervous system refers to:

Accepted Answer

A bundle of axons in the central nervous system

Question 19

Which of the following best explains why action potentials are unidirectional along an axon?

Accepted Answer

The absolute refractory period prevents backward propagation

Question 20

If a neuron is exposed to a toxin that blocks voltage-gated potassium channels, what would be the most immediate effect on the action potential?

Accepted Answer

Repolarization would be delayed, prolonging the action potential

Chapter 11: Fundamentals of the Nervous System and Nervous Tissue – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards