SME
Grade 9 Science · Biology
Body systems, homeostasis and feedback loops
See how feedback loops keep body temperature, blood sugar and water balance steady, and where positive feedback differs.
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During exercise the rise in temperature is the stimulus, and sweating is the response.
The response undoes the stimulus, so this is negative feedback.
Assumptions
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Homeostasis keeps conditions inside the body near a set point, such as about 37 °C.
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Negative feedback undoes the change and switches off once the set point returns.
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Positive feedback makes the change grow until an event ends it.
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Use this to record or read blood glucose after a meal and see insulin bring it back.