The Autonomic Nervous System

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imagesCL3MPY0T A part of the nervous system that regulates vital involuntary functions of the body is the activity of the heart muscle, the muscles of the intestinal tract, and the glands. The autonomic nervous system has two divisions: the sympathetic nervous system, which accelerates the heart rate, constricts blood vessels, and raises blood pressure, and the parasympathetic nervous system, which slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles.” (MedicineNet.com). The sympathetic nervous system is the physical effects of the fight or flight response. The parasympathetic system calms the body down and brings it back to its normal function once the threat is over.

 

 

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