glands. As discussed later, however, these two hormones have certain effects that can be regarded as "tropic." The main physiological action of GH is its stimulatory effect on the growth of the body during childhood. In humans, PRL is essential for the synthesis of milk by the mammary glands during lactation.
The following discussion focuses on ACTH, TSH, and GH. Regulation of the secretion of the gonadotropins and PRL, and descriptions of their actions, are given in greater detail in Chapters 37 to 39.
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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.