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Negative Feedback Loop

(human Thermoregulation)
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*Brain senses change in blood temp. -To warm: vessels dilate(vasodilation-widen) & warm blood flows closer to body surface an loses heat to surrounding air,if still hot sweating sweating begins(heat losing mechanism -Too cold, Vessels in skin constrict (vasoconstriction-narrow) to retain warm blood deeper in body and reduce heat lost; is still cold, shivering(muscle tremor) begins(heat gaining)

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