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Why do we yawn?
Good Question!
Yawning is an involuntary action that causes us to open our mouths wide and breathe in deeply.It is commonly associated with relaxation and drowsiness, our heart rate can rise as much as 30 percent during a yawn, and yawning is a sign of arousal.When we inhale, the air taken in is filling your lungs. Our abdominal muscles flex, and our diaphragm is pushed down. The air we breathe in expands the lungs to capacity and then some of the air is blown  out.
Scientists are discovering there's more to yawning than 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.
Some theories are given by the scientists.
Our bodies induce yawning to draw in more oxygen or remove a buildup of carbon dioxide.The physiological theory,The evolution theory,and the brain cooling theory.
 A more recent theory proposed by researchers is that since people yawn more in situations where their brains are likely to be warmer.


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