In this video I describe the organization of the nervous system, which includes the central nervous system and the peripheral nervous system, which is then divided into the somatic and autonomic divisions. Next I discuss the sympathetic and parasympathetic systems which can activate responses in the autonomic division. I briefly explain how the fight or flight response can influence heart rate, breathing, sweating, digestion, and immune function, and how parasympathetic activation can help us to recover after a threat has passed.

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