why do we yawn?

why do we yawn?
One is that when we are bored or tired, we just don't breathe as deeply as we usually do. As this theory goes, our bodies take in less oxygen because our breathing has slowed. Therefore, yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood.
Full answer in: kidshealth.org
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Is yawning a lot bad?
Excessive yawning can be related to the vagus nerve, which runs from the bottom of the brain down to the heart and stomach. In some cases, excessive yawning may indicate bleeding around the heart or even a heart attack. Other symptoms that may indicate a heart problem include: pain in the chest. Feb 8, 2019
Full answer in: www.medicalnewstoday.com
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Is yawning due to a lack of oxygen?
This seems logical since yawning does bring in more oxygen with a deep breath and the expiration removes more carbon dioxide than the usual breath, but research by putting people in low - oxygen or high- carbon-dioxide environments does not cause yawning.
Full answer in: muschealth.org
What is the main cause of yawning?
In fact, yawning is usually triggered by sleepiness or fatigue. Some yawns are short, and some last for several seconds before an open-mouthed exhale. Watery eyes, stretching, or audible sighs may accompany yawning. Researchers aren't exactly sure why yawning occurs, but common triggers include fatigue and boredom.
Full answer in: www.healthline.com
Why is yawning contagious?
In humans, yawning is a socially modulated response because it can be inhibited by actual—and not virtual—social presence (Gallup et al., 2019) and because a yawn can be triggered by someone else's yawn, as a result of a phenomenon known as contagious yawning (Provine, 1989, 2005). Apr 3, 2020
Full answer in: www.frontiersin.org
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