Vocabulary Nervous System
Nervous System- controls and coordinates functions throughout the body and responds to internal and external stimuli; system
Neurotransmitters - contained in sacs in axon terminals; released to cause stimulus in the next cell; chemicals.
Neurons- cells that transmit impulses.
Action Potential - reversal of charges across the cell membrane of a neuron as an impulse passes
Threshold- minimum level of stimulus needed to activate a neuron
Resting potential - electrical charge across the cell membrane of a neuron
Myelin Sheath- insulating membrane around axon; creates nodes; keeps impulses moving along the axon = more efficient.
Axon - long fiber that carries impulses away from the cell body
Dendrites - short branched extensions that carry impulses towards the cell body
Cell Body- largest part of the cell; contains cytoplasm and nucleus; controls metabolic activity
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