A yawn is a reflex in vertebrate animals characterized by a long inspiratory phase with gradual mouth gaping, followed by a brief climax (or acme) with muscle stretching, and a rapid expiratory phase with muscle relaxation, which typically lasts a few seconds. [2][3] For fish and birds, this is described as gradual mouth gaping, staying open for...

2023年4月25日 · Yawning is an involuntary opening of the mouth to take a deep breath. We likely yawn to help regulate our brain’s temperature and yes, yawns can be contagious.

2024年3月15日 · Yawning is a common reflex in which you open your jaw wide, take a deep breath, and then quickly breathe out. It lasts about 4-7 seconds and often happens when you're waking up or falling asleep....

2023年10月16日 · Yawning is the opening of your airway and mouth to take a long, deep breath of air. It’s a complex muscular movement. In seconds, your entire airway fully dilates (expands). And surrounding muscles powerfully stretch or tense, most significantly around your throat (pharynx). Another term for yawning is oscitation.

2024年10月21日 · Everybody yawns, but why? Discover the possible reasons for yawning, why it seems to be so contagious, and if it can ever pose a risk to health.

2023年10月10日 · Have you ever seen someone yawn and suddenly have the urge to yawn? Contagious yawns have been observed in humans, other mammals, and some birds. It even occurs across species. This type of yawn emerges in …

2020年2月5日 · There are many theories as to why people yawn. One popular theory is that yawning helps your body bring in more oxygen. But this theory has been mostly debunked. Keep reading to see what current...

2013年6月28日 · Yawning appears to be ubiquitous within the animal kingdom. But despite being such a widespread feature, scientists still can’t explain why yawning happens, or why for social mammals, like...

Yawning consists of an involuntary wide opening of mouth with maximal widening of jaw, together with a long and deep inhalation through the mouth and nose, followed by a slow expiration, associated with a feeling of comfort. The average duration of the yawn is 5 s. [1] .

2017年5月24日 · Despite the fact that virtually every human yawns on a daily basis, its function is still largely a mystery. In this Spotlight feature, we delve into the baffling world of yawn science, touching...