nervous system

the system of neurons, nerves, tracts, and associated tissues that, together with the endocrine system, coordinates activities of the organism in response to signals received from the internal and external environments. The nervous system of higher vertebrates is often considered in terms of its divisions, principally the central nervous system, the peripheral nervous system, and the autonomic nervous system. See also conceptual nervous system.

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Psychology term of the day

March 13th 2025

fast muscle fiber

fast muscle fiber

a type of muscle fiber found in skeletal muscle that contracts rapidly but fatigues readily. Compare slow muscle fiber.