2006-07-17 09:57:00 · 15 answers · asked by elisabeth m 2 in Health ➔ Other - Health
Thanks for this question, you made me laugh.
If you mean "Why do people yawn?": 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.
A more recent hypothesis is that yawning is used for regulation of body temperature. Another hypothesis is that yawns are caused by the same chemicals (neurotransmitters) in the brain that affect emotions, mood, appetite and other phenomena. These chemicals include serotonin, dopamine, glutamic acid and nitric oxide. As more of these compounds are activated in the brain, the frequency of yawning increases.
2006-07-17 10:04:11 · answer #1 · answered by justasiam29 5 · 2⤊ 0⤋
That is one great mystery of life. For your information, people, yawning and yorning are quite similar. Yorn is done with no hand over the mouth.
2006-07-17 10:03:56 · answer #2 · answered by Sleek 7 · 0⤊ 0⤋
Yorn for what.. I yawn I do not yorn... Perhaps they are fed up of daft questions,,,,,,, By the way what is loike...
2006-07-17 10:00:49 · answer #3 · answered by Bob The Builder 5 · 0⤊ 0⤋
Yorn is that loike a west country yawn...?
2006-07-17 10:01:23 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Well done, the person sitting next to me has just yawned. You do it because of lack of oxygen, and it is infectious because it is also a behaviour; groups yawn as a prelude to "hey lets get up and do something". Dogs also yawn from tension and excitement.
2006-07-17 10:14:59 · answer #5 · answered by sarah c 7 · 0⤊ 0⤋
People yawn because the lungs and body need more oxygen, therefore, by enlarging that mouth and intake of air, more oxygen is received. Yawning is also contagious, but scientists don't know why.
2006-07-17 10:01:31 · answer #6 · answered by Anonymous · 0⤊ 0⤋
I meber Yored b4. I have however Yawned quite often and that is a lack of Oxygen. Your body tells you you need more so in a yawn you suck a bunch in and it livens you up. Dood Lick!!
2006-07-17 10:01:41 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Somethig to do with oxygen shotage to the brain, which makes you feel tiered. I guess yoooorning boosts the oxygen in take. But that a guess.
2006-07-17 10:02:54 · answer #8 · answered by Dinky 1 · 0⤊ 0⤋
i think u meant "yawn".. well, it's natural body reflex when we're tired or want to sleep. it happens as a try to distribute the air in ur lung as wide as possible.. that's the reason u yawn!!
2006-07-17 10:05:01 · answer #9 · answered by Anonymous · 0⤊ 0⤋
Lack of oxygen
2006-07-17 10:04:34 · answer #10 · answered by Ollie 7 · 0⤊ 0⤋