A) equalise pressure of air on both sides of the ear drum
B) receive more sound
C) allow air to come out of the mouth
D) overcome fear
Correct Answer: A
Solution :
The Eustachian tube is the part of the ear that keeps the atmospheric pressure of the inner ear equal with that of the outside air. Moving the jaw or throat opens up the Eustachian tube, giving it a chance to equalize the pressure behind the eardrum.
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