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Biology 251 Fall 2007
1
TOPIC 9: THE ENDOCRINE SYSTEM
I. Purpose of Topic 9 and Topic 10
A. In these discussions of the endocrine system, we will focus on some general principles and on a
few select systems. Throughout the remainder of the course, as we discuss the different body
systems, we will refer to the general principles you learn in these two topics to provide an
understanding of how each of the body systems is controlled by hormones.
II. General Principles
A. Endocrine system composed of ductless endocrine glands (Fig 6.1)
1. endocrine glands
a) are invaginations of epithelial cells
b) release product (i.e., hormone) to inside of body; blood transports the product
2. Although endocrine glands not connected anatomically, constitute a functional system
3. Only specific target cells respond to a particular hormone; response is based on presence
of specific receptors for that hormone!
B. Two general types of hormones
1. Tropic: act on another endocrine gland to......

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Approximate Word Count: 414
Approximate Pages: 2 (250 words per double-spaced page)

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