Question
Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?
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One can breathe out air totally without oxygen
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One can breathe out air through eustachian tubes by closing both the nose and the mouth
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One can consously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all
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The lungs can be made fully empty by forcefully breathing out all air from them
Solution
B.
One can breathe out air through eustachian tubes by closing both the nose and the mouth
A eustachian tube connects the middle ear cavity with the pharynx. The eustachian the pressure on either side of the eardrum (tympanic membrane).
