Human Anatomy & Physiology (9th Edition)

Published by Pearson
ISBN 10: 0321743261
ISBN 13: 978-0-32174-326-8

Chapter 16 - The Endocrine System - Review Questions - Page 628: 1

Answer

b. humoral

Work Step by Step

parathyroid glands monitor the body’s crucial blood Ca^2+ levels. When they detect a decline from normal values, they secrete parathyroid hormone (PTH). In this case the change of blood Ca^2+ levels is what makes it humoral.
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