Describe the effects of a sympathetic nervous system response.

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adarshanurag's profile pic

adarshanurag | Student, Grade 11 | (Level 1) Valedictorian

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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

eye                                      dilates

Mouth                                  inhibits saliva secretion

Intestine and stomach           digestion stops

Liver                                    converts glycogen into glucose

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zumba96's profile pic

zumba96 | Student, Grade 11 | (Level 3) Valedictorian

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This system usually refers to the flight or fight movement and operates through many connected neurons. 

llltkl's profile pic

llltkl | College Teacher | (Level 3) Valedictorian

Posted on

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.

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