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Olivia and Claire

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Mike Graham

on 31 October 2017

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Transcript of Olivia and Claire

stretching and yawning may be a way to flex muscles
and joints, increase heart rate, and feel more awake. Yawning is believed to be means to keep our brains alert at times of stress.
Yawning you do when your tired or sleepy .
Why do people yawn?
When we are board or tired we don't breath as deeply as we should.Our bodies take in less oxygen because our breathing has slowed.
Breathing in more air
Yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood. Yawning stretches the lungs and the lungs tissue.
Olivia and Claire
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