Yawn - Wikipedia
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.
Why Do We Yawn? - WebMD
2024年3月15日 · When you yawn, a wetting agent known as a surfactant coats the tiny air sacs (alveoli) in your lungs, which helps keep them open. Although no one knows exactly why we yawn, new studies suggest ...
Yawning Causes & Treatment - Cleveland Clinic
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.
Reasons We Yawn: Why Is This Reflex Contagious? - Verywell Health
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.
Why Do We Yawn and Is It Contagious? - Healthline
2020年2月5日 · There are many theories behind why we yawn. Recent studies and research suggest it’s a way our bodies regulate brain temperature. You may also find yourself yawning more if you didn’t get ...
Yawning: Causes and reasons for contagious yawning - Medical News Today
2023年6月26日 · A yawn is an involuntary reflex where the mouth is opened wide, and the lungs take in a lot of air. The air is then exhaled slowly. During a yawn, the eardrums stretch, and the eyes may also...
Why Do You Yawn — and Is It Contagious? - Cleveland Clinic …
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.
Excessive Yawning: Symptoms, Causes, and Treatment - Verywell …
2022年12月5日 · Symptoms of Excessive Yawning. It’s common to yawn several times a day, typically when you wake up and head to bed. Yawning is the body’s response to feeling sleepy or even bored. It can also be prompted involuntarily when you witness other people yawn, often referred to as “contagious” yawning.
Excessive Yawning: Causes, Diagnosis, and Treatment - Healthline
2023年2月16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...
Why Do We Yawn? Science Explains - Science Notes and Projects
2017年8月28日 · We yawn when we see other people or our pets do it. Other vertebrate animals do it too, including cats, dogs, fish, birds, and snakes. Science hasn’t completely nailed down an explanation for why we yawn, but we understand the factors that cause yawning and have theories about contagious yawns.