Answer
d.
Work Step by Step
The pineal gland in the brain produces more melatonin at night to cause us to feel sleepy and less melatonin in the morning to make us wake up. This type of sleep-wake cycle is called a circadian rhythm.
Human Biology, 14 Edition
by Mader, Sylvia; Windelspecht, Michael
Published by
McGraw-Hill Education
ISBN 10:
1-25924-574-8
ISBN 13:
978-1-25924-574-9
Chapter 16 - Assess - Page 357: 15
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