Answer
b. Its level is the highest at night.
c. It is a sleep trigger.
Work Step by Step
Melatonin is released in response to dark environments so its levels are highest at night. It is also considered as a sleep trigger.
Essentials of Human Anatomy & Physiology (12th Edition)
by Marieb, Elaine N.; Hoehn, Katja N.
Published by
Pearson
ISBN 10:
1292216239
ISBN 13:
978-1-29221-623-2
Chapter 9 - The Endocrine System - Review Questions - Page 361: 2
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