Sympathetic nervous system............
Sympathetic nervous system is a part of autonomic nervous system which prepares the body against violent action.It is generally control by Adrenaline secreted by Adrenal gland. It's effect...........
Body part Effects
heart heart beat accelerates
Body hair stands up
Blood vessels constricts
coronary artery dilates
Mouth inhibits saliva secretion
Intestine and stomach digestion stops
Liver converts glycogen into glucose
This system usually refers to the flight or fight movement and operates through many connected neurons.
The human nervous system is divided into two main parts: the central nervous system and the peripheral nervous system. The central nervous system consists of the brain and the spinal cord. The peripheral nervous system consists of the nerves that extend throughout our bodies so that information can be sent back and forth between the peripheral organs and the central nervous system. The peripheral nervous system includes the somatic nervous system and the autonomic nervous system. The somatic nervous system does not serve any function without the integrating capacity of the central nervous system. In contrast, the autonomic nervous system operates, mostly without help from the central nervous system.
The autonomic nervous system is divided into the sympathetic nervous system, which responds to stress, and the parasympathetic nervous system, which is responsible for digestion and other physiological processes that occur when the body is at rest. In times of intense emotional crisis, like when you are trying to escape from a fire in a crowded concert hall, the Hypothalamus Pituitary Adrenal (HPA) axis works in concert with activation of the sympathetic nervous system to maximize our chances of survival under adverse, life threatening conditions. This is popularly termed as the fight-or-flight response.
Thus, a sympathetic nervous system response involves a highly intense physiological reaction. Pupils dilate, mouth dries up, skin and palms perspire, heartbeat and breathing rates increase, adrenal glands release stress hormones, digestion stops, blood vessels constrict, blood sugar increases - to supply the body enough energy to cope up with situations of anxiety or danger. The parasympathetic nervous system returns the body to its normal state, once the causating condition passes by.