Definitions for "Parasympathetic"
A branch of the autonomic system, responsible for "rest and digest" functions.
Part of the involuntary nervous system, the other part is called the sympathetic and together these are considered to be the autonomous nervous system.
A branch of the autonomic nervous system. This system serves as a counterbalance for the sympathetic nerves. Therefore, it causes the heart rate to slow down, lower the blood pressure, constrict eye pupils, and increase digestion.