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nervous system

action potential

the local voltage change across the cell wall as a nerve impulse is transmitted

autonomic nervous system

the part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glands

cerebrospinal fluid

clear liquid produced in the ventricles of the brain


collection of nerve cell bodies in the peripheral nervous system

limbic system

a system of functionally related neural structures in the brain that are involved in emotional behavior

membrane potential

The voltage difference across a membrane


a membrane (one of 3) that envelops the brain and spinal cord


a fatty substance that helps insulate neurons and speeds the transmission of nerve impulses


non-conducting cells of nervous tissue with supportive and metabolic functions

parasympathetic division

part of autonomic nervous system that controls rest and digestion


an automatic instinctive unlearned reaction to a stimulus

somatic nervous system

the division of the peripheral nervous system that controls the body's skeletal muscles

spinal nerves

31 pairs of nerves arising from the spinal cord

sympathetic division

the part of the autonomic nervous system that arouses the body to deal with perceived threats


the junction between two neurons (axon-to-dendrite) or between a neuron and a muscle


a cell that is specialized to conduct nerve impulses


short fiber that conducts toward the cell body of the neuron

synaptic terminal

A bulb at the end of an axon in which neurotransmitter molecules are stored and released

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