central nervous system - brain and spinal cord, peripheral nervous system - includes the nerves and ganglia (clusters of nerve cell bodies) that are outside of the central nervous system., somatic and autonomic nervous systems - are part of peripheral nervous system, somatic nervous system - responsible for nearly all voluntary muscle movements, as well as for processing sensory information that arrives via external stimuli, autonomic nervous system - regulates a variety of involuntary body processes, including heartbeat, blood flow, breathing, body temperature, sympathetic nervous system - "Fight or Flight" response; accelerating heart rate, increasing breathing rate, boosting blood flow to muscles,, parasympathetic nervous system - "Rest and Digest"; Once a threat has passed, this system will slow the heart rate, slow breathing, reduce blood flow to muscles,, reflex arc - sensory nerves that carry signals to the spinal cord and then immediately transmit signals down to muscles that trigger a rapid response to (often painful) stimulus., neuron - cells responsible for receiving sensory input and sending motor commands to our muscles,

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