An Introduction to the Endocrine System
An Introduction to the Endocrine System
An Introduction to the Endocrine System
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<strong>Endocrine</strong> <strong>System</strong> Components<br />
• endocrine system - glands,<br />
tissues, and cells that secrete<br />
hormones<br />
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.<br />
<strong>Endocrine</strong><br />
cells<br />
Target cells<br />
• endocrine glands – organs<br />
that are traditional sources of<br />
hormones<br />
(b) <strong>Endocrine</strong> system<br />
Hormone in<br />
bloodstream<br />
• hormones<br />
chemical messengers that are<br />
transported by <strong>the</strong> bloodstream<br />
and stimulate physiological<br />
responses in cells of ano<strong>the</strong>r<br />
tissue or organ, often a<br />
considerable distance away<br />
• endocrinology – <strong>the</strong> study of<br />
this system and <strong>the</strong> diagnosis<br />
and treatment of its disorders<br />
Key Steps:<br />
1. Hormone syn<strong>the</strong>sized by<br />
tissue.<br />
2. Hormone released in<strong>to</strong> blood.<br />
3. Hormone circulates within<br />
cardiovascular system<br />
4. Hormone leaves blood, diffuse<br />
<strong>to</strong> target tissue’s recep<strong>to</strong>r.<br />
5. Hormone binds <strong>to</strong> recep<strong>to</strong>r.<br />
6. Hormone changes metabolism<br />
of target tissue.
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