2006-10-18 08:06:47 · 12 answers · asked by Lunergrl 2 in Health ➔ Other - Health
Yawning is due to lack of oxygen to the brain. It is ment to clear all the carbon dioxide from bronchiols in the lungs. Thus making them open for oxygen enriched air.
2006-10-18 08:17:48 · answer #1 · answered by ParamedicFireman 2 · 1⤊ 0⤋
Actually its not a lack of oxygen that causes you to yawn. Its an excess of carbon dioxide.
As an aside, its not a lack of oxygen that triggers the need to breathe, but a build up of our old friend CO2
2006-10-18 15:14:31 · answer #2 · answered by shinobisoulxxx 2 · 1⤊ 0⤋
It is caused by lack of oxygen to the body. That is why you also feel sleepy when you yawn, your body needs a good burst of air so it makes you do it by yawning.
2006-10-18 15:17:17 · answer #3 · answered by hot mama 1 · 0⤊ 1⤋
Cause when we're tired, our brains are lacking oxygen so it's instinctive to suck in some air by yawning. Natures little way of telling us what's going on in our bods.
2006-10-18 15:10:05 · answer #4 · answered by Barbie 2 · 1⤊ 1⤋
I had always heard that it was a mechanism for increasing oxygen supply to the brain, but I'm not sure anyone knows for sure...
Check this out:
http://faculty.washington.edu/chudler/yawning.html
http://www.madsci.org/posts/archives/aug97/867090165.Me.r.html
BTW-- that's a great question!
2006-10-18 15:11:28 · answer #5 · answered by answerlady1021 4 · 1⤊ 0⤋
lack of oxygen. and yawning is not contageous - t's just that the other person needed and influx of oxygen also
2006-10-18 15:08:57 · answer #6 · answered by island3girl 6 · 0⤊ 1⤋
i think it's because we don't have enough oxygen in our body.
2006-10-18 15:08:19 · answer #7 · answered by Alex 3 · 0⤊ 1⤋
God has been meaning to fix that mistake.
2006-10-18 15:09:05 · answer #8 · answered by John T 2 · 0⤊ 2⤋
cause we're tired
2006-10-18 15:08:37 · answer #9 · answered by Anonymous · 0⤊ 2⤋
we're tired
2006-10-18 15:09:11 · answer #10 · answered by Ynot me 2 4 · 0⤊ 2⤋