PHYour nostrils work one at a time
When we breathe in and out of our nose during the day, one nostril does most of the work at a time, with the duties switching every several hours. This "You do not have permission to view the full content of this post. Log in or register now." is dictated by the same autonomic nervous system that regulates heart rate, digestion, and other unconscious bodily functions and is the reason why—when our nose gets stuffed up—it does so one nostril at a time.
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