English: This diagram shows a negative feedback loop for human body temperature regulation. 1. The blood vessel is in its homeostatic state. When there is an increase or decrease in the body temperature, an impulse is sent to the hypothalamus of the brain which then sends an impulse into the body that causes the blood vessels to change size. 2. This blood vessel has been dilated so that heat can be released through the skin and the body temperature and blood vessel can return to their normal states. 3. This blood vessel is constricted so that less heat is lost through the skin and the body temperature and blood vessel can return to normal.
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