Sympathetic and Parasympathetic are subdivisions of the autonomic nervous system in vertebrates, closely integrated to govern involuntary physiological responses. The sympathetic nervous system (SNS) primes the body for action during periods of emotional stress, known as ‘fight or flight’ response, causing an increase in heart rate, dilated pupils and accelerated breathing. Conversely, the parasympathetic nervous system (PNS) promotes ‘rest and digest’ activities that occur when the body is at rest, including stimulating digestion, activating metabolism, slowing heart rate, and contracting pupils.

The SNS originates in the spinal cord’s thoracic and lumbar regions while the PNS springs from cranial nerves III, VII, IX, X and sacral segments S2-S4. Both systems work synergistically to maintain homeostasis within the body. They exhibit antagonistic effects on various organs but can also function independently or cooperatively depending on physiological conditions.

At a molecular level, both systems communicate via neurotransmitters; norepinephrine for SNS and acetylcholine for PNS. These neurotransmitters bind to specific receptors on target organs leading to varied responses.

Exact Match Keyword:
Sympathetic and Parasympathetic

N-gram Classification:

Substring Matches:
Sympathetic, Parasympathetic


Search Intent:
Medical information

Semantic Relevance:

Parent Category:
Health Sciences

Autonomic Nervous System, Neurology

Fight or Flight Response (for Sympathetic), Rest and Digest Response (for Parasympathetic)

Similar Searches:
Sympathetic nervous system, Parasympathetic nervous system functions

Related Searches:
Autonomic nervous system, Sympathetic vs. parasympathetic nervous system

Geographic Relevance:

Topically Relevant Entities:
Norepinephrine, Acetylcholine


Is it time to take charge of your health?

Book an appointment or join our waitlist today.


2/44 Links Ave, East Ballina, NSW 2478

Ballina Osteopath

Foundation Health is your local provider of Osteopath services. We offer a wide range of Osteo treatments to the communities surrounding Lennox Head, East Ballina, Ballina, Suffolk Park and Byron Bay.

Take care of all your injuries by booking an appointment today!

Clinic Hours
Mon - Friday

8:00am – 6:30pm

9:00am – 3:00pm

Reception Hours
Mon - Friday

8:00am – 4:30pm
Copyright© Foundation Health Osteopathy 2024
Book Online
The review us on google badge.