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Endocrine System Part 2

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Uploaded on May 22, 2007

Endocrine System Part Exocrine and endocrine glands
An exocrine gland has a duct or ducts. An endocrine gland is a gland which does not have ducts. Ducted exocrine glands produce a product, for example sweat, and that product then passes through a duct to where it is going to be used, so the sweat is deposited on the surface of the skin. An endocrine gland has no ducts but does have a large blood supply. Endocrine products are the hormones which are deposited directly into the blood stream.

Hormone and target organs
A hormone is a chemical messenger. It is produced in an endocrine gland, travels in the blood and when it reaches it's target tissue has some physiological effect on that target tissue. For example, thyroxin is released from the thyroid gland, travels in the blood too many cells of the body where it has the effect of stimulating the cells to increase their metabolic rate. A target organ is an organ which is affected and undergoes a physiological change when it is stimulated by the chemical messenger, that is by a hormone.

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