Question

What is sympathetic nervous system and parasympathetic nervous system

Answer 1

The sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response.
Theparasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.


EXPLAINED ONE

The parasympathetic nervous system (PNS) controls homeostasis and the body at rest and is responsible for the body's "rest and digest" function.
The sympathetic nervous system (SNS) controls the body's responses to a perceived threat and is responsible for the "fight or flight" response. The PNS and SNS are part of the ANS, or autonomic nervous system which is responsible for the involuntary functions of the human body.

Comparison chart Parasympathetic nervous system versus Sympathetic nervous system comparison chart Parasympathetic nervous system Sympathetic nervous system Introduction Function Originates in Activates response of Neuron Pathways General Body Response Cardiovascular System (heart rate) Pulmonary System (lungs) Musculoskeletal System Pupils Gastrointestinal System Salivary Glands Adrenal Gland Glycogen to Glucose Conversion Urinary Response

The parasympathetic nervous system is one of the two main divisions of the autonomic nervous system (ANS). Its general function is to control homeostasis and the body's rest-and-digest response.	The sympathetic nervous system (SNS) is one of two main divisions of the autonomic nervous system (ANS). Its general action is to mobilize the body's fight-or-flight response.
Control the body's response while at rest.	Control the body's response during perceived threat.
Sacral region of spinal cord, medulla, cranial nerves 3, 7, 9, and 10	Thoracic and lumbar regions of spinal cord
Rest and digest	Fight-or-flight
Longer pathways, slower system	Very short neurons, faster system
Counterbalance; restores body to state of calm.	Body speeds up, tenses up, becomes more alert. Functions not critical to survival shut down.
Decreases heart rate	Increases contraction, heart rate
Bronchial tubes constrict	Bronchial tubes dilate
Muscles relax	Muscles contract
Constrict	Dilate
Increases stomach movement and secretions	Decreases stomach movement and secretions
Saliva production increases	Saliva production decreases
No involvement	Releases adrenaline
No involvement	Increases; converts glycogen to glucose for muscle energy
Increase in urinary output	Decrease in urinary output