Answer is :
- C) parasympathetic nervous system
Explanation :
Vagal tone is mediated by...
- C) parasympathetic nervous system
Vagal tone is the the 10th carnial nerve. Vagal tone is the activity of vagus nerve, and also the fundamental component of parasympathetic Branch of autonomic nerve system.
The long nerve that runs from the brain down through the chest and into the abdomen is known as vagus nerve.