Test Your Understanding of Concepts and
1. Explain how regulation of the neurohypophysis and of the adrenal medulla are related to the embryonic 5. origins of these organs.1
2. Explain the mechanism of action of steroid hormones and thyroxine. 6.
3. Explain why polar hormones cannot regulate their target cells without using second messengers. Also explain how cyclic AMP is used as a second messenger in hormone action. 7.
4. Describe the sequence of events by which a hormone can cause an increase in the Ca2+ concentration within a target cell. How can this increased
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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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