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One of the fundamental properties of all organisms: the capacity to detect, interpret, and respond to changes in the environment (e.g. the stimuli of light, touch, chemicals, etc.). Multicellular animals have specialized sense organs and effector organs for this purpose; in unicellular organisms, which lack a nervous system, the reception of and response to a stimulus occur in the same cell.

Subjects: Sports and Exercise Medicine — Biological Sciences.

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