About 75% of All Parasympathetic Fibers are in the _______

Question

About 75% of all parasympathetic fibers are in the _______ nerves.
A) optic
B) phrenic
C) trigeminal
D) vagus

Accepted Answer

The vagus nerve contains about 75% of all parasympathetic fibers, which regulate a variety of bodily functions such as digestion, heart rate, and respiratory rate. The other options mentioned - optic, phrenic, and trigeminal nerves - do not contain a significant number of parasympathetic fibers.