Homeostasis

Negative Feedback(Homeostasis)
- Stimulus: Body temperature rises
- (Receptors)-Temperature sensors in skin and hypothalamus send Information that affects contorl center
- (Brain) sends commands to (Effectors)- Sweat glands in skin increase
- Blood vessels in skin dilate
- Response: Increase heat loss, body temperature drops
Positive Feedback(Homeostasis)
- An initial stimulus produces a response that exaggerates or enhances the change in the original conditions, rather than opposong it.
- Ex. Blood Clotting
- Break in blood vessel wall causes bleeding-Damaged cells release chemicals-Clotting begins-Additional chemicals released-Clotting accelerates(positive feedback loop)-Blood clot plugs break in vessel wall; bleeding stops

Author

AHSJ1029

72701

Card Set

Homeostasis

Description

Negative and Positive Feedback

Updated

2011-03-14T00:35:52Z

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