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Anatomy lesson 1.5

The Nervous System

TermDefinition
nervous system made of structures that control the actions and reactions of the body
brain the body’s central; command organ; it constantly receives impulses from all over the body
spinal cord allows your brain to communicate with the rest of your body
peripheral nervous system two main parts: the sensory part and the motor part
central nervous system includes the brain and the brain stem
nerve collection of nerve cell extensions bundles together with blood vessels and connective tissue
neuron a cell that moves messages in the form of a fast-moving electrical energy
dendrite a short extension of a cell body
axon an extension of the neuron; carries impulses
impulse the signal that travels along the length of a nerve fiber and ends in the release of neurotransmitters
neurotransmitter a chemical signal that has been changed from an electrical signal; released into the gap between the neuron and other cells
myelin the protective sheath around the axon
Created by: rippert
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