Yawning ....

Haaahw..... !! Have you wondered what causes this yawning. No body really knows the exact cause of yawning, but there are many theories to support yawning

One such is that the person yawns when he becomes lethargic and the oxygen level in his blood decreases and the content of carbon dioxide increases. Through yawning the intake of oxygen can increase and reduce the carbon dioxide.

But practically when the person is supplied with less oxygen does not increasingly yawn and when he is supplied with more carbon dioxide he does not yawn continuously Hmmmm...... quite surprising isn't it !!

Other theory is that is the mechanism which is used to expand the lung tissues and it prevents rigidity. It allows good flow of air and keeps the mind fresh.

Another theory says that it helps to distribute a liquid to the lungs which acts as lubricant. It promotes good contraction and relaxation for the lungs.

Yawning is an involuntary reflex action. It mostly takes place when the body is very tired or when the mind is bored. No body knows when it is likely to occur.

Hope ...... i didn't keep you yawning while reading ;)

Have a nice day !!