Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 34 - Self-Quiz - Page 601: 11

Answer

b. melatonin

Work Step by Step

During low light conditions, the pineal gland secretes melatonin, which causes sleepiness. As the sun comes up and the amount of light increases, melatonin secretion decreases. This fall in melatonin levels triggers a person's waking mechanism.
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