When do we yawn?
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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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Answered by
3
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We yawn when we are sleepy or bored or tired cause then we wont be active and the oxygen wont go into our brain and thus due to that we yawn to bring more oxygen to our brain...
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