Why do humans yawn

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Why do humans yawn

In: Biology

to draw more air into the lungs. especially when we’re tired we need more oxygen to keep us alert and functioning. we sneeze to get rid of old air in our lungs and foreign particles in our airway. so the two serve opposite functions. we also yawn in response to other humans sometimes, but that’s more of an empathetic response

There is no complete understanding of why we yawn. Various theories have been proposed and various studies have been undertaken to determine why we yawn.

No single theory has gathered overwhelming support, so there really is no agreed upon reason for why we yawn.

This entry in wikipedia is a good read and explains in detail what I wrote above. Enjoy!!

https://en.wikipedia.org/wiki/Yawn

and going further: why did I feel the need to yawn isntantly after reading your title?