Assertion: yawning | /r/CapableOf | serve as a defence reflexof the ear
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Source sentences:
text: This observation has led to another proposition that yawning might actually serve as a “defence reflex” of the ear, which is triggered either by rapid altitude changes or by other conditions that lead to trapping of air in the middle ear, and is helpful in equalising the air pressure in the middle ear with the outside air pressure.