Autonomic Nervous System

The autonomic nervous system (ANS) regulates many organs of the body. The ANS is part of the peripheral nervous system and it controls many organs and muscles within the body. The ANS controls the involuntary forces in the body. The ANS regulates the muscles of the eye, stomach, heart, and blood vessels.

The ANS can be divided into three main parts: the sympathetic nervous system, the parasympathetic nervous system, and the enteric nervous system.

The sympathetic nervous system responses when you are exposed to emergency situations. These emergency situations are known as "fight or flight" situaations. The sympathetic system uses energy, your heart beats faster, and digestion slows down.

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The Sympathetic Nervous System
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The parasympathetic nervous system is the opposite of the sympathetic nervous system. When this system responds it is trying to conserve energy. Blood pressure will decrease, the heart will beat slower, and digestion will begin.

Parasympathetic Nervous System
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Enteric Nervous System
The enteric nervous system is a network of nerve fibers that connects with the internal organs of the body, such as the intestines and pancreas.

The ANS is always working. ANS also internal functions of the body.