homeostasis - the regulation of the internal conditions of a cell or organism to maintain optimum conditions for function, in response to internal and external changes., vasodilation - the widening of the arterioles that supply blood to the skin capillaries, stimulus - change in either the internal or external environment, receptor - cells that detect a stimulus and send information to the central nervous system, effector - muscles or glands that take a signal from the central nervous system and generate a response, endocrine - system that uses chemical messengers or hormones to send signals from glands to target cells, phototropism - a movement by a plant in response to light, auxin - a chemical messenger used by plants,

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