Why Do You Yawn?
Everybody yawns, but how many of you know why do we yawn? This question has been answered by people in different ways. While some have formulated theories related yawning, others are still hypothetical about it. Some think that it is an involuntary action triggered by brain, due to the lack of oxygen supply to the body, while others consider it as an expression of boredom, fatigue and drowsiness. This behavior is not restricted to human beings. Cats, dogs and fish also yawn. This brings out a possibility that yawning is some sort of communication. If you want to find out the possible causes of yawning, go through the following lines.
Causes Of Yawning
- According to an old hypothesis, yawn is considered as a reflex action triggered by the brain on the account of lack of oxygen and excess build up of carbon dioxide.