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PARASYMPATHETIC NERVOUS SYSTEM

 Parasympathetic division includes: a few cranial nerves, e.g. the vagus nerve, as well as fibres that arise from the sacral portion of the spinal cord. Therefore, this division is often referred to as the craniosacral portion of the autonomic system. In the parasympathetic division the preganglionic fibre is long while the postganglionic fibre is short because the ganglia lie near or within the organ.

The parasympathetic division, sometimes also called the housekeeper division, promotes all the internal responses that are associated with a relax state, for example, it causes the pupil of the eye to constrict, promotes digestion of food by causing the flow of saliva and other gut secretions, and retards the heartbeat. The parasympathetic division brings about the responses associated with a relaxed state while sympathetic division is associated with those responses associated with ‘fight’ or flight

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