At a given moment, if you’re breathing through your nose, the lion’s
share of the air is going in and out of one nostril, with a much smaller
amount passing through the other. Every few hours, your autonomic
nervous system, which takes care of your heart rate, digestion and other
things you don’t consciously control, switches things up and your other
nostril does all the heavy lifting for a little while. The opening and
closing of the two passages is done by swelling and deflating erectile
tissue – the same stuff that’s at work when your reproductive organs are
aroused – up in your nose.
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