Air pressure in the middle ear cavity is regulated by the:
A)eardrum
B)eustachian tube
C)fluid in the middle ear
D)auditory bones

Question

Quizplus · Accepted Answer

The eustachian tube connects the middle ear to the back of the throat and helps regulate air pressure in the middle ear cavity. When we yawn or swallow, the eustachian tube opens briefly, allowing air to flow into or out of the middle ear and equalize pressure. This is why our ears sometimes "pop" when we are flying in an airplane or driving up a mountain, as changes in altitude can cause changes in air pressure that affect the middle ear.

Air Pressure in the Middle Ear Cavity Is Regulated by The