As a cook chops red onions he begins to tear up due to activation of the lacrimal gland. Which of the following nerves provided the stimulus?
A) the facial nerve (VII)
B) the olfactory nerve (I)
C) the vagus nerve (X)
D) the optic nerve (II)

Question

Quizplus · Accepted Answer

The facial nerve (VII) is responsible for carrying the efferent (motor) signals to the lacrimal gland that produce tears. When chopping onions, the chemicals released stimulate sensory nerves in the eye, which then send signals through the facial nerve to activate the lacrimal glands, leading to tear production.

As a Cook Chops Red Onions He Begins to Tear