Does anyone know what makes you yawn?

Question

Does anyone know what makes you yawn?

Answer 1

lack of oxygen to the brain

Answer 2

fatigue and other people yawning!

Answer 3

It is actually caused by the bodies need for oxygen

Answer 4

the preacher on sunday mornings. good god I have better things to do than listen to that **** talk.

Ta ta,

C.R.

Answer 5

YOU NEED SLEEP or FOOD

Answer 6

being tired abviously..

Answer 7

They Thought a few years ago it was the lack of oxygen to your brain, but my Biology teacher, who also went to med school, and a study I read in a medical journal said that isn't true. My teacher said they don't Really know and the medical journal said a new study is saying it is because your brain gets over worked, and it's like cooling your brain??? Not lack of oxygen. If it was a lack of oxygen your brain would swell most likely.

Answer 8

a lack of oxygen

Answer 9

For that you’ll first have to understand what happens when we breathe. Normally, when you breathe in, you inhale oxygen and your body uses it up. The body makes a waste product called as carbon dioxide that is exhaled from the lungs when you breathe out.

When you are sleepy, bored or tired, you breathe more slowly. Your body requires oxygen and needs to throw out the carbon dioxide. So, your brain makes you take an extra breath, which is deep and long called a yawn, so that you can take in more of oxygen and give out carbon dioxide fully.

Now, next time, if your teacher asks you, "why are you yawning?", you can say that her class is boring and your body needs oxygen for which your brain has sent a message to your lungs to take an extra deep breath called the yawn.

Answer 10

Grey matter needs . . . yawn . . . oxygen.

Answer 11

if your not breathing correctly (you may not nottice) your brain will lack some oxygen and the fastest way to get the oxygen is to yawn

Answer 12

i dont know if this is right

but iheard lack of oxygen makes your vody yawn

..to get more oxygen?

me personaly

if someone yawns it makes me want to yawn :D

Answer 13

While the dictionary tells us that yawning is caused by being fatigued, drowsy or bored, scientists are discovering that there is more to yawning than what most people think. Not much is known about why we yawn or if it serves any useful function, and very little research has been done on the subject. However, there are several theories about why we yawn. Here are the three most common theories:

The Physiological Theory -- Our bodies induce yawning to drawn in more oxygen or remove a build-up of carbon dioxide. This theory helps explain why we yawn in groups. Larger groups produce more carbon dioxide, which means our bodies would act to draw in more oxygen and get rid of the excess carbon dioxide. However, if our bodies make us yawn to drawn in needed oxygen, wouldn't we yawn during exercise? Robert Provine, a psychologist at the University of Maryland, Baltimore County, and a leading expert on yawning, has tested this theory. Giving people additional oxygen didn't decrease yawning and decreasing the amount of carbon dioxide in a subject's environment also didn't prevent yawning.

The Evolution Theory -- Some think that yawning is something that began with our ancestors, who used yawning to show their teeth and intimidate others. An offshoot of this theory is the idea that yawning developed from early man as a signal for us to change activities.

The Boredom Theory -- In the dictionary, yawning is said to be caused by boredom, fatigue or drowsiness. Although we do tend to yawn when bored or tired, this theory doesn't explain why Olympic athletes yawn right before they compete in their event. It's doubtful that they are bored with the world watching them.

Answer 14

Yehhh. Easyy!

Wen you get really tired,

( bored )

your breathing slows down.

And you yawn just to get more air thru your lungs.

That's why people say you are bored.

[]:

Answer 15

Boring people or the opera??

Answer 16

It is caused by the lack of oxygen in your blood stream as your body prepares for sleep.