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NEGATIVE FEEDBACK
How do NEGATIVE AND POSITIVE FEEDBACK maintain homeostasis?
1) Output shuts off original stimulus or reduces intensity
2) Mechanisms cause the variable to change in an opposite direction, returning the ideal value
• goal is to prevent sudden severe changes within the body
• example: when you eat too much sugar too quickly, insulin is released to bring blood sugar back to normal
POSITIVE FEEDBACK
1) Result or response enhances the original stimulus to accelerate the output
2) Change proceeds in the same direction as the original disturbance, deviating it farther from its original value
• typically do not require continuous adjustments
• example: when skin breaks, blood platelets immediately clot and release chemicals to attract more platelets, stopping bleeding
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