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Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?
One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all
The lungs can be made fully empty by forcefully breathing out all air from them
One can breathe out air totally without oxygen
One can breathe out air through Eustachian tubes by closing both the nose and the mouth
Answers (1)
Under normal circumstances, the oxygen content of inhaled air is around 20.84%, while the oxygen content of exhaled air is around 15.7%. Even if a person holds their breath, it is impossible to completely exhale air without oxygen. The Eustachian tube is the passage that connects the middle ear to the nasopharynx.It controls the pressure inside the middle ear to equal the air pressure outside the body. No one can exhale air through the Eustachian tube by closing their nose and mouth at the same time.Yes, a person can consciously inhale and exhale moving the diaphragm alone, without moving the ribs at all.The lungs cannot be completely emptied by forcefully exhaling all the air. There is always residual volume in the lungs, even after maximum exhalation.This represents approximately 1500 ml of air.
So the correct answer is "One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all." and therefore option 1.
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