Submitted by SteptimusHeap t3_z31ozx in askscience
DennyRombardt t1_ixo1fsb wrote
Reply to comment by SteptimusHeap in What physically decides whether air goes through the nose or through the mouth? by SteptimusHeap
It doesn't. It blocks air coming in from your mouth. You can have your mouth open and only breath through your nose. Your epiglottis and tonsils close up at the back of your throat to block it. There is no internal way for you to block your nose.
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