5 Endocrine - Hormones and the endocrine system I n...

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Unformatted text preview: Hormones and the endocrine system I n addition to electrical signals in the nervous system, chemical signals in the endocrine system are a primary means by which anatomical, physiological, and behavioral changes are regulated in humans. The chemical signals in the endocrine system are hor mones . Chemical communication requires both a cell (or group of cells) that produces and releases the hormone and a cell (or group of cells) with an appropriate receptor that receives the hormone. The interaction between the hormone and the receptor activates mechanisms within the target cell that lead ultimately to anatomical, physiological, or behavioral changes. Humans produce a wide array of hormones that regulate a large number of changes or responses. Most hormones in humans are produced by endocr ine glands , which are aggregations of cells that secrete hormones into the extracellular fluid, from which they enter the blood. After entering the blood, the hormones may be transported throughout the body. The major human endocrine glands are shown in Figure 41.5 in the text. The endocrine system contains both lipid-soluble and water -soluble hormones, which differ in how they bind to receptors in or on the target cells. Lipid-soluble hor mones Lipid-soluble hormones include the steroid hormones....
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5 Endocrine - Hormones and the endocrine system I n...

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