Autonomic nervous system

Autonomic nervous system is a part of Peripheral nervous system that supplies the blood vessels, stomach, intestine, liver, kidney, bladder, genitals, lungs, pupils, heart, salivary & digestive glands.

The Autonomic Nervous System has two main divisions
(i) Sympathetic
(ii) Parasympathetic
Many organs are controlled primarily by either the sympathetic and the parasympathetic division. Sometimes the two divisions have opposite effects on the same organ. For eg. the sympathetic division increases blood pressure and the parasympathetic division decreases it. Overall the two divisions work together to ensure that the body responds appropriately to different situations. The Autonomic Nervous System regulates internal body processes such as blood pressure, heart & breathing rates, body temperature, digestion, metabolism, the balance of water& electrolytes, the production of body fluids like saliva, sweat & tears, urination, defecation & sexual response.