2006-08-23 13:31:08 · 15 answers · asked by equestrian♥ 2 in Health ➔ Other - Health
Yawning is a mechanism of our bodies to try to increase the oxygen in our blood. When we get tired it is because the oxygen levels in our blood is low due to being up and moving around and burning calories.
We can't always get enough oxygen by yawning but it helps to put off the inevitable, the fact that we need sleep, sleep that slows our bodies down and gives us a chance to rebuild the oxygen that our bodies need.
2006-08-23 13:38:30 · answer #1 · answered by wetsaway 6 · 0⤊ 0⤋
A long-standing hypothesis is that yawning is caused by an excess of carbon dioxide and lack of oxygen in the blood. The brain stem detects this and triggers the yawn reflex. The mouth stretches wide and the lungs inhale deeply, bringing oxygen into the lungs and hence to the bloodstream. It is almost certain however, that this hypothesis is not correct. One study documented that this effect does not exist.[2] A more recent hypothesis is that yawning is used for regulation of body temperature.
2006-08-23 20:38:06 · answer #2 · answered by Amy 5 · 0⤊ 0⤋
Yawning increases oxygen to the brain.
2006-08-23 20:38:38 · answer #3 · answered by donna L 1 · 0⤊ 0⤋
When too much CO2 builds up in the blood it needs be released. That is where yawning comes from.
2006-08-23 20:32:48 · answer #4 · answered by Anonymous · 1⤊ 0⤋
We yawn to give oxygen to our brains
2006-08-23 20:34:35 · answer #5 · answered by katkraziee_04 1 · 1⤊ 0⤋
we yawn when our brain relizes that it has a shortness of oxigen. when thay yawns are contagus its true. when u see somone yawn ur brain wants to make sure u have oxigen in ur head. im 13 and i know that!
2006-08-23 20:36:33 · answer #6 · answered by iceflace 1 · 1⤊ 0⤋
Lack of oxygen
2006-08-23 20:36:20 · answer #7 · answered by trace 2 · 1⤊ 0⤋
it is a sign of lack of oxygen in the brain.
2006-08-23 20:33:00 · answer #8 · answered by yfort 2 · 1⤊ 0⤋
We're letting out all the thoughts we never expressed.
2006-08-23 20:38:13 · answer #9 · answered by Anonymous · 0⤊ 0⤋
It is a reaction, a response our bodies make because we are tired.
2006-08-23 20:36:37 · answer #10 · answered by Sapphire 3 · 0⤊ 1⤋