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is it to get extra energy?

2006-11-28 08:14:05 · 15 answers · asked by laughing_stock 1 in Society & Culture Cultures & Groups Other - Cultures & Groups

15 answers

It's because your brain needs more oxygen because it's starting to shut down.

2006-11-28 08:16:13 · answer #1 · answered by Eve 5 · 1 1

A yawn 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.
A yawn can express strong anti-social messages, and so in some cultures people try to mute or mask them by placing a concealing hand over the yawning mouth.
previous 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.

2006-11-28 12:03:14 · answer #2 · answered by rusty red 4 · 1 0

So, the question remains - why do we yawn? Dr. Provine suggests that perhaps yawning is like stretching. Yawning and stretching increase blood pressure and heart rate and also flex muscles and joints. Evidence that yawning and stretching may be related comes from the observation that if you try to stifle or prevent a yawn by clenching your jaws shut, the yawn is somewhat "unsatisfying." For some reason, the stretching of jaw and face muscles is necessary for a good yawn.

2006-11-28 08:25:30 · answer #3 · answered by Martha P 7 · 0 0

we yawn when the body has too much carbon dioxide and too little oxygen. This usually occurs when we are tired and first thing in the morning. The yawn expands the lungs and provides a large inhalation of oxygen to steady the levels.

2006-11-28 08:31:11 · answer #4 · answered by GLEN H 1 · 0 0

Yawns are caused by a lack of oxygen to the brain. It probably has nothing to do with being tired.

2006-11-28 08:16:18 · answer #5 · answered by Anonymous · 0 0

NO

You yawn when you are sleepy or tired. Because your respiratory rate goes down when you are sleepy and the amplitude of inspiration and expiration becomes decreased.

This results in decreased oxygenation of the blood and increase in Co2 of the blood , this results in due to various mechanisms results in increase i n Potassium and Urate levels in the body.

This leads to the irritation of the phrenic nerve which supplies diaphragm the muscle seperating the abdominal cavity from thorax and causes the contraction of diaphragm, resulting in a big inspiration. to accommodate more air or oxygen into lungs we YAWN.

2006-11-28 08:21:16 · answer #6 · answered by Eyedoc 4 · 0 0

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2016-12-29 15:18:46 · answer #7 · answered by jamila 3 · 0 0

Yawns are to get more O2 to your brains you dont have to be tired to yawn

2006-11-28 08:18:20 · answer #8 · answered by bollrog69 1 · 0 0

for oxygen as our brains are not getting enough. when we are tired we dont breath very much. so we should always be allowed to yawn as long as we cover our mouths and dont do it right in another person's face which isn't very sensible.

2006-11-28 08:18:44 · answer #9 · answered by yellowhaze 2 · 0 0

Don't know but your question just prompted me to YAWN

2006-11-28 08:21:09 · answer #10 · answered by Sunnee 3 · 0 0

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