Parasympathetic division

Parasympathetic Division

The Parasympathetic Division is a part of the autonomic nervous system that is responsible for rest and digest activities. It is often referred to as the "rest and digest" system, as it conserves energy and slows the heart rate, while increasing intestinal and gland activity.

Function

The primary function of the parasympathetic division is to conserve and restore energy in the body. It slows the heart rate, dilates blood vessels, increases salivation, and stimulates digestion. The parasympathetic division also plays a role in sexual arousal and other functions related to relaxation and enjoyment.

Anatomy

The parasympathetic division is made up of cranial nerves and sacral nerves. The cranial nerves include the oculomotor, facial, glossopharyngeal, and vagus nerves. The sacral nerves are located in the lower back and are responsible for functions related to the lower part of the body, such as bowel and bladder control.

Neurotransmitters

The primary neurotransmitter of the parasympathetic division is acetylcholine. Acetylcholine is released by parasympathetic nerve fibers and acts on two types of receptors, muscarinic and nicotinic receptors.

Parasympathetic vs Sympathetic

The parasympathetic division is often contrasted with the sympathetic division, which is responsible for the body's fight or flight response. While the sympathetic division prepares the body for action, the parasympathetic division helps the body to relax and recover.

See Also

• Autonomic nervous system
• Sympathetic division
• Acetylcholine
• Cranial nerves
• Sacral nerves

References

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