Control of Hormonal Secretions page 512

The concentration of each hormone in the body fluids is precisely regulated.

1. Control sources a. Some endocrine glands secrete in response to nerve impulses.

b. Other glands secrete hormones in response to releasing hormones the hypothalamus secretes.

2. Negative feedback systems a. In a negative feedback system, a gland is sensitive to the concentration of a substance it regulates.

b. When the concentration of the regulated substance reaches a certain concentration, it inhibits the gland.

c. As the gland secretes less hormone, the controlled substance also decreases.

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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