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The endocryne system: How it works

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The basic units of this system are special kinds of glands. Unlike other glands, endocryne glands secrete their products called hormones directly into the blood stream. The powerful hormones travel everywhere in the body, influencing every aspect of life in very specific ways. Many parts of the body secrete hormones, but six major kinds of glands are of particular importance to adults. There are the Islets of langerhans in the pancreas, The thyroid and parathyroid, the adrinals, the gonads, and in the head, the pituitary. Every major endocryne gland is a highly structured organ. Throughout each run the smallest blood vessels, capillaries. Hormones are secreted into the capillaries. Through a microscope it is possible to see red blood cells as they move though the capillaries and veins. Hormones, however, are not actually visible They are in solution in the blood plasma just as salt is in solution in sea water and is invisible. The hormones enter the general circulation. Eventually, they filter back to the capillaries elsewhere in the body. Unlike the red blood cells, hormones travel freely through the capillary walls. Though they travel everywhere in the body, hormones only influence specific target cells. A hormone may have relatively few targets, affecting only a few kinds of cells. A different hormone may affect nearly every cell in the body. Every target cell has a chemical receptor which the hormone specifically fits as a key specifically fits a lock. The receptor may be on the surface of the cell or inside it. A cell that is not a target for a specific hormone has no receptors for it and is not affected by it.

Video Details

Duration: 2 minutes and 26 seconds
Country: United States
Language: English
Views: 482
Posted by: lolaceituno on Feb 5, 2009

Functions of the endocryne system

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