Peripheral Nervous System
Autonomic nervous system and Somatic nervous system
Somatic nervous system
Involved in both sensory and motor functions, serving mainly the skin and skeletal muscles.
Efferent impulses: carry messages from the brain to the skeletal muscles
Afferent impulses: carry messages from the sensory organs to the brain
Autonomic nervous system
Controls what is generally involuntary, automatic activity
Consists of the sympathetic and parasympathetic nervous systems.
Sympathetic nervous system
Fight of flight response
Sends out messages (neurotransmitters) to the body preparing the body for fight or flight.
Also prepares the body for strenuous activity
Parasympathetic nervous system
Restores equilibrium in the body
Decreases arousal, slows breathing and heart rate, lowers heart rate and blood pressure, etc.
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