What is the role of the eustachian tube? a. to send electrical messages to the auditory nerve. b. to maintain equal air pressure on both sides of the eardrum. c. to pick up sound waves. d. to carry vibrations to the inner ear.

B. To maintain equal air pressure on both sides of the eardrum.

Explanation:

The eustachian tube opens with every gulp, swallow or yawn to act as a sort of pressure-equalizing valve for the middle of the ear. It also serves to drain the mucus produced by the inner-lining of the middle ear.

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