Human Anatomy and Physiology by Kent M. Van De Graaf & R. Ward Rhees

Author:Kent M. Van De Graaf & R. Ward Rhees
Language: eng
Format: epub
Publisher: McGraw-Hill

Hormones

A hormone is a chemical messenger secreted by an endocrine gland. Its chemical composition is such that it has its effect on specific receptor sites on target cells causing a series of biochemical events that leads to a specific response. Hormones are classified according to chemical structure and the location of the cell membrane receptors on their target cells.

Table 13.1 Classes and Composition of Hormones

Hormones are divided into two groups, based on the location of the receptors on the target cells. Group I hormones bind to intracellular receptors and are lipophilic. These include the steroid hormones. Group II hormones bind to cell surface receptors and are hydrophilic. These hormones include polypeptide, glycoprotein, and catecholamine hormones.

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