Aleaha Schwinn - What Happens When I Yawn?

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Table of Contents

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What Happens When I Yawn?

Aleaha Schwinn

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My Body Does Strange Stuff!

By Aleaha Schwinn

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Please visit our website, www. garethstevens. com. For a free color catalog of all our high-quality books, call toll free 1-800-542-2595 or fax 1-877-542-2596.

Library of Congress Cataloging-in-Publication Data

Schwinn, Aleaha. What happens when I yawn? / by Aleaha Schwinn. p. cm. ( My body does strange stuff) Includes index. ISBN 978-1-4339-9358-9 ( pbk. ) ISBN 978-1-4339-9359-6 ( 6-pack) ISBN 978-1-4339-9357-2 ( library binding) Reflexes Juvenile literature. Respiration Juvenile literature. I. Title. QP372. S39 2014 dc23

Published in 2014 by Gareth Stevens Publishing East 14th Street, Suite New York, NY 10003

Copyright 2014 Gareth Stevens Publishing

Designer: Michael J. Flynn Editor: Greg Roza

Photo credits: Cover Kameel4u/Shutterstock. com; p. Jupiterimages/Thinkstock. com; p. CLIPAREA/Shutterstock. com; p. Dorling Kindersley/Getty Images; p. Rob Lewine/Getty Images; p. DuleS/Shutterstock. com; p. Monkee Business/ Thinkstock. com; p. Geoffrey Kuchera/Shutterstock. com; p. Thinkstock. com; p. OJO Images/Getty Images.

All rights reserved. No part of this book may be reproduced in any form without permission in writing from the publisher, except by a reviewer.

Printed in the United States of America

CPSIA compliance information: Batch #CS13GS: For further information contact Gareth Stevens, New York, New York at 1-800-542-2595.

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Contents

Close Your Mouth!

How It Works

I Didnt Mean to Do It!

Why Do We Do It?

Yawning Too Much?

Glossary

For More Information

Index

Boldface words appear in the glossary

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Close Your Mouth!

You might yawn when you stay up late or just after getting out of bed. Many people yawn when theyre bored. Or you might yawn because someone else just did! Scientists arent exactly sure why we yawn. However, they have a few interesting ideas.

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How It Works

A small part on the bottom of the brain controls many of the bodys activities, including yawning. This part of the brain sends messages out to the body and makes it yawn.

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brain

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When we yawn, our brain tells muscles all over the body to work. The mouth opens wide to let in a lot of air. Muscles around the lungs help us take a deep breath. After a short pause, these muscles push the air back out of the lungs.

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I Didnt Mean to Do It!

Yawning is involuntary. That means our bodies do it without us choosing to do so. We know its involuntary because babies do it before theyre born. You may even find yourself yawning just because you saw a picture of someone yawning!

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Why Do We Do It?

When we breathe in, we take in oxygen, which our body needs to keep working. When we breathe out, our body gets rid of a waste gas called carbon dioxide. We might yawn to get more oxygen into our bodies or to get rid of extra carbon dioxide.

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breathe in oxygen

breathe out carbon dioxide

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Many scientists think we yawn to cool off our brain. Yawning increases blood flow in the head. The air we breathe in during a yawn cools the blood that passes close to the mouth. This cooler blood may then help cool the brain.

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Many animals yawn, but only people, chimps, and dogs yawn when they see others do it. Some scientists now think this shows you care about others around you. Yawning might be a way of sharing our feelings.

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Some scientists think yawning might be something people long, long ago did to communicate and the habit just stuck with us. Perhaps people once yawned to show their teeth and scare enemies away, somewhat like many wild animals do.

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WHY DO YOU THINK PEOPLE YAWN?

take in oxygen, get rid of carbon dioxide

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