內容介紹 | |
-
出版社:BB
-
ISBN:0761415890
-
作者:BETH FERGUSON
-
頁數:47
-
出版日期:2004-01-01
-
印刷日期:2004-01-01
-
包裝:平裝
-
開本:24開
-
版次:1
-
印次:1
-
What's the hardest part of your body? It's not your bones or your fingernails. It's your teeth. Teeth need to be strong because they chew up all the food you eat. When you chew your food, digestion begins. During this process, the bits of food you swallow travel to your stomach. Chemicals in your stomach break down the bits into even smaller particles called nutrients. Next, the nutrients move into your small intestine, where they enter your blood vessels. Your blood then carries the nutrients to the rest of your body, so they can help you breathe, flex muscles, and think during tests.
-
Teeth Are For Chewing Two Sets of Teeth Four Kinds of Teeth The Parts of a Tooth When Teeth Need Help Cavities and Gum Disease Keeping Teeth Healthy Glossary Find Out More Index
| | |