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5
The Peripheral Nervous System
– Somatic nervous system:• Controls the movement of skeletal muscles or
transmits somatosensory information to the central nervous system.
– Autonomic nervous system:• Controls the body’s vegetative functions.• “fight or flight” response
• Sympathetic division:– Controls functions that accompany arousal and expenditure of
energy.
• Parasympathetic division:– Controls functions that occur during a relaxed state.
Chemical SynapseNeurotransmitters Are Released in Exocytosis
Releasing the neurotransmitter into the synapse
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Lifespan of a neurotransmitter
1. Synthesis
2. Storage
3. Release
4. Action on the target cell
5. Deactivation