Question 1

Which of the following best describes the main function of dendrites in a neuron?

Accepted Answer

To receive incoming signals from other neurons and convey them to the cell body

Question 2

Which structure in the nervous system is primarily responsible for mediating reflexes such as the knee-jerk response?

Accepted Answer

Spinal cord

Question 3

During an action potential, which ion rapidly enters the neuron, causing depolarization of the membrane?

Accepted Answer

Sodium (Na\^+)

Question 4

Which of the following is a function of the sympathetic division of the autonomic nervous system?

Accepted Answer

Preparing the body for 'fight or flight' by increasing heart rate and inhibiting digestion

Question 5

Which animal group is characterized by a diffuse nerve net rather than a centralized nervous system?

Accepted Answer

Cnidarians

Question 6

What is the primary role of the myelin sheath in vertebrate neurons?

Accepted Answer

To increase the speed of action potential propagation along the axon

Question 7

Which part of the brain is most directly involved in coordinating movement and balance?

Accepted Answer

Cerebellum

Question 8

A patient suffers a stroke that damages the left cerebral hemisphere. Which of the following is most likely to be affected?

Accepted Answer

Mathematical and logical reasoning

Question 9

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

Accepted Answer

The refractory period prevents the action potential from moving backward

Question 10

Which process is most directly responsible for the formation of long-term memories in the brain?

Accepted Answer

Rearrangement and strengthening of synaptic connections in the cerebral cortex

Question 11

Which of the following is a correct pairing of nervous system division and its primary function?

Accepted Answer

Enteric division – regulates digestion

Question 12

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

Accepted Answer

They create the blood-brain barrier and support neurons

Question 13

Which of the following is true regarding the localization of brain function?

Accepted Answer

Each lobe of the cerebral cortex specializes in processing different types of information

Question 14

Which of the following best explains the phenomenon of neural plasticity?

Accepted Answer

The strengthening or weakening of synaptic connections in response to activity

Question 15

A person is startled by a loud noise, causing their heart rate to increase and digestion to slow. Which division of the nervous system is primarily responsible for this response?

Accepted Answer

Sympathetic division

Question 16

Which of the following best describes the difference between gray matter and white matter in the central nervous system?

Accepted Answer

Gray matter consists mainly of neuron cell bodies, while white matter consists mainly of myelinated axons

Question 17

Which of the following is a real-world example of the importance of brain localization, as learned from a famous medical case?

Accepted Answer

A person with frontal lobe damage experiences radical changes in personality

Question 18

Which of the following best describes the function of afferent neurons?

Accepted Answer

They bring sensory information from the body to the CNS

Question 19

Which of the following is a key difference between the nervous systems of protostomes and deuterostomes?

Accepted Answer

Protostomes have a ventral nerve cord, while deuterostomes have a dorsal nerve cord

Chapter 49: Nervous Systems – Structure and Function

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