central nervous system - brain and spinal cord; our body’s speedy electrochemical messaging system, peripheral nervous system - includes the nerves and ganglia; somatic and autonomic=two divisions, somatic nervous system - system responsible for nearly all voluntary muscle movements, as well as for processing sensory information, autonomic nervous system - regulates a variety of involuntary body processes that take place, including heartbeat, blood flow, breathing, body temperature, etc, sympathetic nervous system - by regulating the flight-or-fight response, this system prepares the body to expend energy to respond to environmental threats, parasympathetic nervous system - helps restore normal body functions after fight or flight; "paramedics"., reflex arc - include sensory nerves that carry signals to the spinal cord and then immediately transmit signals down to muscles that triggered the reflex, efferent neurons - sends signals away from the central nervous system; motor neurons, afferent neurons - sends signals into the central nervous system; sensory neurons, interneurons - specialized nerve cells in the central nervous system that act as connectors between sensory and motor neurons,

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