Jennifer Prior - The Digestive System

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Jennifer Prior

The Digestive System Prior

System

Digestive

The

Image Credits

Cover Dim Dimich/Shutterstock; p.3 Elena Elisseeva/Shutterstock; p.4 Zurijeta/Shutterstock;

p.5 FDB Photography/Shutterstock; p.5 Galina Barskaya/Shutterstock; p.6 spotmatik/

Shutterstock; p.8 wavebreakmedia ltd/Shutterstock; p.10 AISPIX/Shutterstock;

p.12 Anetta/Shutterstock; p.14 ElenaGaak/Shutterstock; p.15 Elena Elisseeva/

Shutterstock; p.16 Ariwasabi/Shutterstock; p.16 inset: Manuela Weschke/Shutterstock;

p.21 wavebreakmedia ltd/Shutterstock; p.21 inset: risteski goce/Shutterstock; p.22 LUGO/

iStockphoto; p.23 dragon_fang/Shutterstock; p.24 Monkey Business Images/Shutterstock;

p.24 inset: stacey_newman/iStockphoto; p.26 monticello/Shutterstock; p.27 Monkey

Business Images/Shutterstock; p.27 inset: sevenke/Shutterstock; p.28 wavebreakmedia ltd/

Shutterstock; p.29 Monkey Business Images/Shutterstock; p.32 Africa Studio/Shutterstock;

back cover: sevenke/Shutterstock

Based on writing from TIME For Kids.

TIME For Kids and the TIME For Kids logo are registered trademarks of TIME Inc.

Used under license.

Teacher Created Materials

5301 Oceanus Drive

Huntington Beach, CA 92649-1030

http://www.tcmpub.com

ISBN 978-1-4333-3677-5

2012 Teacher Created Materials, Inc.

Reprinted 2013

Consultant

Timothy Rasinski, Ph.D.

Kent State University

Lisa A. Leewood, C.S.T.

Erin P. Wayne, M.D.

Publishing Credits

Dona Herweck Rice, Editor-in-Chief

Robin Erickson, Production Director

Lee Aucoin, Creative Director

Conni Medina, M.A.Ed., Editorial Director

Jamey Acosta, Editor

Heidi Kellenberger, Editor

Lexa Hoang, Designer

Stephanie Reid, Photo Editor

Rachelle Cracchiolo, M.S.Ed., Publisher

Synched Read-Along Version by:

Triangle Interactive LLC

PO Box 573

Prior Lake, MN 55372

ISBN-13: 978-1-68444-854-8 (e-book)

Table of Contents

Eat Your Vegetables .................

No Guts, No Glory ...................

The Digestive System ................

When Things Go Wrong .............

One Amazing Machine ..............

Glossary ...........................

Index .............................

About the Author ..................

Eat Your Vegetables

Mom, do I have to eat my vegetables?

Yes, honey, theyre good for you.

Why are they so good? They dont taste good.

When you eat healthy food, it gives your body nourishment.

What does that mean?

Nourishment feeds your body so it can work the way its

supposed to work.

What happens to food when we eat it?

Well, the vitamins and other nutrients in the food get

absorbed into the body.

What does absorbed mean?

It means they get soaked up into the bloodstream.

But, Mom, how does that happen?

Youre stalling. Eat your vegetables.

Once you take

a bite, your

food begins an

amazing journey

through the

digestive system.

No Guts, No Glory

Human beings need food in order to feed the body. The

healthier the food is, the better it is for your body. But what

happens to food once we chew and swallow? Food is processed

in the body by the digestive system. It is broken down into

smaller and smaller pieces. Then it is absorbed into the body.

This gives the body fuel to produce energy.

We all know how food first gets into the body. We eat it!

Thats the first step in the process, but there is much more to

know about digestion.

GI Track

The digestive system

is also called the

gastrointestinal

(gas-troh-in-TES-tuh-nl)

track , or GI track. Gastro

refers to the stomach.

Intestinal refers to the

intestines. The stomach

and intestines are two

important parts of the

digestive system.

The Digestive System

The digestive track is about feet long! It begins with the

mouth. It includes the pharynx (FAR-ingks) and the esophagus

(ih-SOF-uh-gus). It also includes the stomach , the small

intestine , and large intestine .

Did you know that the digestive system knows when food

is coming? This happens even before you eat. When you see,

smell, or even think about a tasty treat, the brain tells your

body to get ready for food. Your mouth starts to water and the

digestive system gears up for a feast!

Did you know that

eating healthy foods,

chewing well, getting

plenty of exercise,

and keeping a

positive attitude all

help your body to

digest better?

Complete

Digestive

System

tongue

pharynx

stomach

large

intestine

esophagus

liver

pancreas

small

intestine

Mouth

The first step in the digestive process begins with the mouth.

You use your teeth to chew food and break it into small pieces.

Saliva in the mouth helps soften the food as it is chewed. This

is because there are chemicals in saliva. They change the food.

For example, they turn starches into simple sugars. Saliva

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