General+Info+on+Glands+and+Hormones

Two types of Glands:
 * Glands** are organs that specialize in the secretion of substances needed by an organism.

the ducts to their targets
 * EXOCRINE**
 * have ducts; substances go through

into the blood
 * ENDOCRINE**
 * ductless glands; substances go directly

Produces chemical messengers called **Hormones**.

cells to absorb sugar. EX: blood sugar levels
 * NEGATIVE FEEDBACK:** blood sugar rises above a specific point, insulin is released. Insulin causes
 * POSITIVE FEEDBACK:** a change initiates a response, and that response intensifies he original change.[[image:salvary-glands.jpg width="189" height="214" align="left"]]



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__**Target cells:**__ Cells effected by a particular hormone with specific recipitor.


 * __Receptor Molecules:__** Protein on cell membranes that recieve messages.