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.

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....

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.

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10月21日 · A yawn is an involuntary reflex that involves opening the mouth wide and taking in a deep breath, followed by a slow exhale. Several theories exist about why we yawn, but researchers have not...

2023年10月10日 · Yawning is considered "contagious" because when you see someone else yawn, it often stimulates you to yawn, too. This article explains the theories and reasons behind yawning and why it can be contagious.

The meaning of YAWN is to open wide : gape. How to use yawn in a sentence.

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...

2024年12月12日 · Yawning is the involuntary action that makes our jaw go wide and the exhalation of the deep breath we take in while our mouth is open. Yawns are more likely to occur in moments of tediousness or drowsiness. If you see, hear, think about, or even read about it, it will trigger an urge to yawn.

2025年2月26日 · A yawn is an involuntary reflex where you open your mouth, breathe in deeply, and then quickly exhale. Researchers aren’t exactly sure why yawning occurs, but common triggers include fatigue...