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Central Nervous System

Processes, interprets, and stores information; issues orders to muscles, glands, and organs

Sensory Nerves

Carry messages to spinal cord

Motor Nerves

Carry orders from CNS to body


Little antennas that receive messages from nervous system

Axon terminal

Ends of axons resembling branches

Myelin Sheath

Fatty insulation that may surround the axon of a neuron


Site where nerve impulse is transmitted from one nerve cell to another

Action Potential

Electrical current or impulse


Chemical substance

Receptor Siles

Special molecules in membrane


Substance secreted by organs called glands, that affect functioning of other organs


Bundle of fibers

Somatic Nervous System

Controls skeletal muscles

Sympathetic Nervous System

Mobilizes body for action, energy input

Parasympathetic N. S.

Conserves energy, maintain quiet state

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