Nasal cycle
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In humans the nasal cycle is the normal ultradian cycle of each nostril's blood vessels becoming engorged in swelling, then shrinking. During the course of a day they will switch over approximately every four hours or so.<ref>http://www.webmd.com/content/article/4/1680_51935.htm?lastselectedguid=%7B5FE84E90-BC77-4056-A91C-9531713CA348%7D</ref>
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