Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which one of the following structures participates in a reflex?

a. the gray matter of the brain

b. the white matter of the brain

c. the gray matter of the spinal cord

d. an interneuron that stimulates an afferent neuron

e. an interneuron that inhibits an afferent neuron

Summary Introduction


An involuntary instant unconscious reaction of a stimulus that is regulated by the nervous system of the body is called reflex or reflex arc. A reflex arc is composed of receptors (sensory nerve cells) and effectors (muscle cells).


Justification of correct answer:

Option (c) is “spinal cord’s gray matter.” The gray matter of the spinal cord is responsible for carrying impulse between the brain and the PNS (peripheral nervous system). The spinal cord contains gray matter in the core area, which is surrounded by white matter. These gray matter and white matter appear as a butterfly structure in the cross-sectional view of the spinal cord. An example of the reflex pathway is a knee-jerk reflex. Hence, option (c) is the correct answer.

Explanations for the incorrect answers:

Option (a) is “a gray matter of the brain.” The major component of the central nervous system is gray matter. Gray matter comprises most of the brain’s neural cell bodies. The gray matter of the brain is responsible for controlling muscle movement, hearing, memory, emotions, and speech...

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