2006-10-20 04:46:50 · 22 answers · asked by Anonymous in Science & Mathematics ➔ Biology
To make others sympathetically react.
2006-10-20 04:51:24 · answer #1 · answered by Anonymous · 0⤊ 1⤋
Good question, from what I've heard no-one really knows.
Main thinking now is that yawning is an old reflex message to other animals as a signal to get 'up and ready', for example wild dogs yawn and stretch in the morning to signal the rest of the pack to prepare to hunt.
2006-10-20 12:43:17 · answer #2 · answered by magooio 1 · 0⤊ 0⤋
A yawn (synonyms chasma, oscitation from the Latin verb oscitare, to open the mouth wide[1]) is a reflex of deep inhalation and exhalation associated with being tired, with a need to sleep, or from lack of stimulation. Pandiculation is the term for the act of stretching and yawning. Yawning is a powerful non-verbal message with several possible meanings, depending on the circumstances. It is also claimed to help increase the state of alertness of a person. The exact causes of yawning are still unknown.
2006-10-20 11:48:45 · answer #3 · answered by DanE 7 · 2⤊ 0⤋
yawn: to open the mouth somewhat involuntarily with a prolonged, deep inhalation and sighing or heavy exhalation, as from drowsiness or boredom.
A yawn (synonyms chasma, oscitation from the Latin verb oscitare, to open the mouth wide) is a reflex of deep inhalation and exhalation associated with being tired, with a need to sleep, or from lack of stimulation. Pandiculation is the term for the act of stretching and yawning. Yawning is a powerful non-verbal message with several possible meanings, depending on the circumstances. It is also claimed to help increase the state of alertness of a person. The exact causes of yawning are still unknown.
2006-10-20 11:57:01 · answer #4 · answered by Lek 6 · 0⤊ 0⤋
Something about too much carbon dioxide in the body and the yawn giving the body the oxygen it's craving
2006-10-20 11:49:01 · answer #5 · answered by David J 2 · 0⤊ 0⤋
The reason we yawn when we are tired is because our brain is not getting enough oxygen.
If we see someelse yawn, we tend to yawn also, this is because our body automatically thinks there is not enough oxygen in the air.
2006-10-20 11:56:55 · answer #6 · answered by Jenni T 1 · 0⤊ 0⤋
It was thought for a long time that yawns were related to the rise in carbon dioxide in the blood. Recent work has found that this is not true. At this point in time we don't have a clue.
2006-10-20 11:55:50 · answer #7 · answered by oldhippypaul 6 · 0⤊ 0⤋
to get rid of more carbondioxide and to take more oxygen. according to this theory ,when people are bored or tired, they breathe more slowly. As breathing slows down , less oxygen makes it to the lungs.As carbon di oxide builds up in blood , a message to the brain results in signals back to the lungs saying , "take a deep breath, " and a yawn is produced.
Yawning increase blood pressure and heart rate and also flex muscles and joints.
2006-10-20 12:06:01 · answer #8 · answered by apurva 2 · 0⤊ 0⤋
the truth no one is 100% sure why we yawn.. it has been suggested that it is to increase oxygen flow to the brain but this seems unlikely.. it is known that babies still in the womb will yawn and it helps in the development of their lungs
2006-10-20 12:45:03 · answer #9 · answered by blue_cabbage 2 · 0⤊ 0⤋
Because your brain needs more oxygen. When you yawn, you take a very deep breath and this helps you take in more oxygen.
2006-10-20 11:50:04 · answer #10 · answered by KittyKattsMeow 3 · 1⤊ 0⤋
Medical science still doesn't know what causes or what the purpose is of yawning.
2006-10-20 11:48:58 · answer #11 · answered by Anonymous · 1⤊ 1⤋