Aeromedical factorsQuestion 723 of 934

Which tube lets air pressure equalize in the middle ear?

  1. The semicircular canal
  2. The Eustachian tube
  3. The optic nerve
  4. The vestibular nerve
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Correct answer: The Eustachian tube

The Eustachian tube connects each middle ear to the back of the throat. It opens during chewing, yawning, or swallowing.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 17: Aeromedical Factors — Middle Ear and Sinus Problems, page 427

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Questions last reviewed: 18 October 2026