Test Yourself Before You Continue

1. Describe the mechanisms by which the secretion of parathyroid hormone and of calcitonin is regulated.

2. List the steps involved in the formation of 1,25-dihydroxyvitamin D3 and state how this formation is influenced by parathyroid hormone.

3. Describe the actions of parathyroid hormone, 1,25-dihydroxyvitamin D3, and calcitonin on the intestine, skeletal system, and kidneys, and explain how these actions affect the blood levels of calcium.

4. Account for the different effects of 1,25-dihydroxyvitamin D3 on bones according to whether calcium intake is adequate or inadequate.

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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