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insulator that allows ions to flow between segments rather than along entire length of membrane; increases velocity of ignal
Rapid transmission of a nerve impulse along an axon, resulting from the action potential jumping from one node of Ranvier to another, skipping the myelin-sheathed regions of membrane.
have one process; the dendritic portion of each of these extends away from the CNS and axon projects into CNS
neurons: structural classifications
four types, based on number of processes extending from cell body
afferent, mostly pseudounipolar (carry signals from peripheral sensory receptors to the CNS)
efferent, multipolar (transmits signal away from CNS to an effector, such as skeletal muscle or organ
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