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Why do we yawn?

Do you yawn when you're sleepy? Do you know why? All animals, including people, need to breathe in oxygen and to breathe out carbon dioxide. Sometimes your breathing slows down. You don't breathe deeply enough to get all the oxygen you need and to get rid of enough carbon dioxide. Scientists believe a yawn is a very deep breath which brings in a lot of oxygen and expels a lot of carbon dioxide.

Most animals yawn. Scientists aren't sure, though, why seeing someone else yawn can make another person want to yawn, too. Does looking at these pictures make you want to yawn?
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No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1996 Gale, Cengage Learning. All rights reserved.

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Author:Tschudy, Noelle
Publication:Jack & Jill
Date:Jul 1, 1996
Words:103
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