Question

why and how does yawn happens??? plzzz tell me this answer....​

Answer 1

Answer:

One is that when we are bored or tired, we just don't breathe as deeply as we usually do. As this theory goes, our bodies take in less oxygen because our breathing has slowed. Therefore, yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood.

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Answer 2

Answer:

A yawn is an involuntary reflex where the mouth is opened wide, and the lungs take in a lot of air. The air is then exhaled slowly. During this time, the eardrums stretch, and the eyes may also close tight, causing them to water.....

Explanation:

This is involuntary action reflex.... This happens when the mind is tired....

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