Body temperature falls (gets cold), Skeletal muscles: involuntary contractions to produce heat (shivering), Goosebumps form to trap warm air close to skin, Blood vessels: constrict, Sweat glands: do not secrete fluid, Body temperature rises (gets hot), Sweat glands: open to sweat to cool the body by evaporation, Hair follicle muscles: relax, Blood vessels: dilate

Thermoregulation

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