Endocrine system

Endocrine system - The University of North Carolina at...

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Unformatted text preview: The University of North Carolina at Chapel Hill The University of North Carolina at Chapel Hill Endocrine System EXSS 175 - Human Anatomy The University of North Carolina at Chapel Hill The University of North Carolina at Chapel Hill Endocrine System Endocrine system: Regulation of body activities by releasing hormones Hormones: Chemical messengers transported in blood from an endocrine gland to a target organ The University of North Carolina at Chapel Hill The University of North Carolina at Chapel Hill Endocrine vs. Nervous System Characteristic Nervous Endocrine Mediator Molecules Nerve impulses Hormones Cells Affected Muscles, glands, other neurons Virtually all body cells Time to onset of action Milliseconds Seconds hours days Duration of action Generally briefer Generally longer The University of North Carolina at Chapel Hill The University of North Carolina at Chapel Hill Homeostasis Condition of equilibrium (balance) in the bodys internal environment Endocrine system helps maintain the body homeostasis mostly through negative feedback system The University of North Carolina at Chapel Hill The University of North Carolina at Chapel Hill Negative Feedback System Negative feedback system reverses a change in a controlled condition Homeostasis The University of North Carolina at Chapel Hill The University of North Carolina at Chapel Hill Negative Feedback Control Negative feedback is seen when the output of a pathway inhibits inputs to the pathway. The heating system in your home is a simple negative feedback circuit. When the furnace produces enough heat to elevate temperature above the set point of the thermostat, the thermostat is triggered and shuts off the furnace (heat is feeding back negatively on the source of heat). When temperature drops back below the set point, negative feedback is gone, and the furnace comes back on. The University of North Carolina at Chapel Hill The University of North Carolina at Chapel Hill Glands Exocrine glands: Secretion to ducts that carry the secretion into body cavities, lumen of organs, or outside of the body Examples: Sudoriferous, sebaceous, mucous, digestive Endocrine glands: Secretion into extracellular space for diffusion into the blood The University of North Carolina at Chapel Hill The University of North Carolina at Chapel Hill Endocrine Glands Endocrine glands (exclusive) Pituitary Thyroid Parathyroid Adrenal Pineal The University of North Carolina at Chapel Hill The University of North Carolina at Chapel Hill Endocrine Glands Thymus gland Pancreas...
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This note was uploaded on 11/16/2011 for the course EXSS 175 taught by Professor Zinder during the Fall '08 term at UNC.

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Endocrine system - The University of North Carolina at...

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