The autonomic nervous system (ANS) is a division of the peripheral nervous system responsible for regulating involuntary bodily functions to maintain internal balance and respond to external stimuli. It operates without conscious control and consists of two main branches:

Sympathetic Nervous System (SNS):
This branch is often associated with the "fight or flight" response. When activated, it prepares the body for action by increasing heart rate, dilating airways, and redirecting blood flow to muscles, among other responses. It helps the body respond to stress or danger.

Parasympathetic Nervous System (PNS):
The PNS is often referred to as the "rest and digest" system. It promotes relaxation and recovery by...