why does air enter the lungs upon inhalation
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why does air enter the lungs upon inhalation
how does air enter the lungs
air flows into the lungs during exhalation
during inhalation the lungs
how does air get into the lungs
air enters the human lungs because
what happens in the lungs during inhalation
why our lungs expand during inhalation
how do lungs inhale air
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air pressure in lungs during inhalation
air flow during inhalation
how the lungs are inflated during inhalation
lungs during inhalation and exhalation
inhaled air enters the
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air left in lungs after exhalation
inhalation and exhalation of air
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