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Defend Earth from alien invaders
collects information about internal and external environment(sensory)
processing information and making decisions
directing muscles and glands to act(motor)
Central Nervous System
brain and spinal cord
Peripheral Nervous System
cranial and spinal nerves
Somatic Nervous System
not excitable. Support, protect or insulate neurons
receive action potentials(electric impulses)
generates action potentials
carries action potential away from cell body
-junctions between consecutive neurons
-axon terminals contain vesicles of neurotransmitter(specialized chemicals)
-neurotransmitter binds to receptor sites on dendrite(post-synaptic membrane), opening sodium gates and causing depolarization of neuron
Autonomic Nervous System
not under conscious control or awareness
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