Question 1

Which of the following best describes the overall organization of the nervous system?

Accepted Answer

It consists of the central nervous system (CNS) and peripheral nervous system (PNS), with the CNS including the brain and spinal cord, and the PNS including all neural tissue outside the CNS.

Question 2

Which type of neuroglia is primarily responsible for forming the myelin sheath in the central nervous system?

Accepted Answer

Oligodendrocytes

Question 3

Which structural feature of a neuron is most directly responsible for receiving synaptic input from other neurons?

Accepted Answer

Dendrites

Question 4

A patient presents with a loss of sensation in the limbs. Which functional classification of neurons is most likely affected?

Accepted Answer

Sensory (afferent) neurons

Question 5

Given Ohm's law $$V = IR$$, if the resistance ($$R) in a $$neuron membrane increases while the current ($$I) $$remains constant, what happens to the voltage ($$V) $$across the membrane?

Accepted Answer

Voltage increases

Question 6

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

Accepted Answer

Voltage-gated channels

Question 7

How is the resting membrane potential primarily generated in neurons?

Accepted Answer

By the active transport of sodium and potassium ions via the sodium-potassium pump

Question 8

During an action potential, what is the main difference between depolarization and hyperpolarization?

Accepted Answer

Depolarization is when the membrane potential becomes less negative (more positive), while hyperpolarization is when it becomes more negative than the resting potential.

Question 9

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 10

What is the correct sequence of events during the propagation of an action potential down the axon?

Accepted Answer

Opening of voltage-gated sodium channels, followed by opening of voltage-gated potassium channels, then restoration of resting potential

Question 11

Which factor most directly affects the conduction velocity of action potentials along an axon?

Accepted Answer

The presence of myelin and the diameter of the axon

Question 12

Which of the following is a correct classification of nerve fibers based on their diameter and conduction speed?

Accepted Answer

Type A fibers are large and fast, Type C fibers are small and slow

Question 13

In a chemical synapse, which event occurs first?

Accepted Answer

Calcium ions enter the presynaptic terminal

Question 14

Which of the following best describes an excitatory postsynaptic potential (EPSP)?

Accepted Answer

A postsynaptic potential that depolarizes the membrane, increasing the likelihood of an action potential

Question 15

Which two types of neurotransmitter receptors are found on the postsynaptic membrane?

Accepted Answer

Ionotropic and metabotropic receptors

Question 16

Which neurotransmitter is classified as both excitatory and inhibitory depending on the receptor type?

Accepted Answer

Acetylcholine

Question 17

A patient is given a drug that blocks the reuptake of serotonin. What is the expected effect on neural integration?

Accepted Answer

Increased serotonin levels in the synaptic cleft, enhancing postsynaptic activation and neural integration

Question 18

Which equation best represents the relationship between membrane potential ($$V_m$$), ion concentrations, and permeability according to the Goldman-Hodgkin-Katz equation?

Accepted Answer

$$V_m = \frac{RT}{F} \ln \left( \frac{P_{K^+}[K^+]_{out} + P_{Na^+}[Na^+]_{out} + P_{Cl^-}[Cl^-]_{in}}{P_{K^+}[K^+]_{in} + P_{Na^+}[Na^+]_{in} + P_{Cl^-}[Cl^-]_{out}} \right)$$

Question 19

If a neuron receives both excitatory and inhibitory inputs simultaneously, which process determines whether an action potential will be generated?

Accepted Answer

Spatial and temporal summation of postsynaptic potentials

Question 20

A patient with multiple sclerosis experiences slowed nerve conduction. Which structural change in the nervous system is most likely responsible?

Accepted Answer

Loss of myelin sheaths around axons

Chapter 11 Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards