Homeostasis - The maintenance of a constant internal environment, Optimum temperature - The best temperature for enzymes to work, Negative fedback - A change sets of a response that cancels out the change, Sensory receptors - Structures that detect a change in the internal environment, Hypothalamus - Region of the brain in that has sensory receptors to detect a change in blood temperature, Sweating - Liquid released onto skin. Water evaporates to cool the body, Shivering - The rapid contraction and relaxation of muscles to generate heat, Vasoconstriction - The narrowing of arterioles close to the surface of the skin to reduce heat loss by radiation, Vasodilation - The increase in the diameter of arterioles close to the surface of the skin to increase blood flow and release of heat by radiation, Thermoregulation - The control of body temperature,

IGCSE Homeostasis

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