Question 1

Which of the following best describes the relationship between axon diameter and the speed of impulse propagation?

Accepted Answer

Larger diameter axons conduct impulses faster because they have less resistance to ion flow.

Question 2

A patient suffers a spinal cord injury that damages only the motor tracts. Which of the following symptoms would most likely be observed?

Accepted Answer

Loss of voluntary movement below the injury site.

Question 3

Which of the following is a function of the blood-brain barrier?

Accepted Answer

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

Question 4

Which equation best represents the relationship between the speed of nerve impulse ($$v$$), axon diameter ($$d$$), and myelination?

Accepted Answer

$$v = k \cdot d$$ for myelinated axons, where $$k is a $$constant

Question 5

Which of the following best describes the function of the myelin sheath?

Accepted Answer

It increases the speed of impulse conduction by allowing saltatory conduction.

Question 6

A patient is unable to distinguish between touch and pressure sensations. Which receptors are most likely damaged?

Accepted Answer

Meissner's corpuscles and Pacinian corpuscles

Question 7

Which of the following statements about the repair of nervous tissue is correct?

Accepted Answer

CNS neurons have limited ability to repair due to inhibitory factors and lack of neurolemma.

Question 8

Which of the following is NOT a function of cerebrospinal fluid (CSF)?

Accepted Answer

Transmits electrical impulses between neurons

Question 9

Which of the following best defines proprioception?

Accepted Answer

The awareness of the position and movement of the body

Question 10

Which of the following is the largest part of the brain?

Accepted Answer

Cerebrum

Question 11

A patient presents with loss of sensation but intact motor function. Which area of the spinal cord is most likely damaged?

Accepted Answer

Sensory tracts

Question 12

Which of the following best describes referred pain?

Accepted Answer

Pain perceived at a location other than the site of the painful stimulus

Question 13

Which of the following cranial nerves is responsible for vision?

Accepted Answer

Optic nerve (II)

Question 14

Which of the following best defines a reflex?

Accepted Answer

An involuntary, rapid response to a stimulus

Question 15

Which of the following is a function of the cerebellum?

Accepted Answer

Coordination of voluntary movements and balance

Question 16

Which of the following best describes the difference between gray and white matter in the brain?

Accepted Answer

Gray matter is located on the surface (cortex) of the brain, while white matter is deeper.

Question 17

Which of the following is the space that contains cerebrospinal fluid (CSF)?

Accepted Answer

Subarachnoid space

Question 18

Which of the following is NOT a function of the central nervous system (CNS)?

Accepted Answer

Production of hormones for digestion

Question 19

Which of the following best defines sensation versus perception?

Accepted Answer

Sensation is the detection of stimuli, while perception is the conscious interpretation of those stimuli.

Question 20

Which of the following is a major function of the spinal cord?

Accepted Answer

Conducting sensory and motor impulses between the body and brain

BIO 141 Lecture Exam 3 Study Guide: Nervous System Overview

Study Guide - Practice Questions