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endocrine - faculty.leeu.edu/~rwest/humanbio/end Chemical...

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Chemical Coordination: Endocrine System Hormonal Integration 1. Endocrine system composed of Endocrine glands which secrete hormones . . . -small, well-vascularized ductless glands composed of groups of cells arranged in cords or plates which secrete hormones . . . -chemical messengers transported by the blood to some part of body - "target cells" - where initiate definite physiological responses. 2. Gland types: Endocrine - ductless, carried by blood stream (ie. thyroid, pituitary, thymus, ovaries, etc.) Exocrine - have ducts, discharge onto free surface. (ie. sweat, sebaceous, salivary, pancreas, etc.) 3. Nervous system - response fast (fractions of seconds) Endocrine system - response slower (several seconds) Together they function as a single, united system. 4. I.D. Endocrinology 5. Indirect mechanism of hormone action - cell surface receptors Direct mechanism of hormone action - cytoplasmic receptors 6. Hormone secretion rates controlled by "negative feedback systems" Invertebrate Hormones 7. Primary source
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