Negative feedback, the skin's role in temperature regulation, and the control of blood glucose.
Homeostasis keeps the internal environment constant by negative feedback (detect a change → respond → reverse it).
Temperature control
The skin responds to keep body temperature ~37 °C:
Too hot: sweating (evaporation cools), vasodilation (skin arterioles widen → more blood near the surface → more heat lost).
Too cold: shivering (respiration releases heat), vasoconstriction, hairs raised by erector muscles.
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