Body Temperature Drops, Detected by hypothalamus., Erector pili muscles contract and hairs on skin stand up, Muscles rapidly contract to shiver, Vasoconstriction: blood vessels get narrower to reduce heat loss, Body Temperature Increases, Detected by hypothalamus, Erector pili muscles relax and hairs on skin lie flat, Sweat glands excrete sweat to cool skin, Vasodilation: blood vessels dilate to increase heat loss

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