Hot answers tagged biology
The answer to the valve-question,1 according Pilotfriend, seems to be the "floppy walled Eustachian tubes". During ascent the gas (air) in the middle ear cavity expands and a small amount of pressure builds up against the ear drum causing them to bulge outwards ever so slightly (that ‘fullness’ you feel in your ears just before they ‘Pop’). This pressure ...
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