The Human Body EYE BRAIN TOOTH HEART LUNG STOMACH LIVER KIDNEY SKIN BOWELS
Table of Contents Skin Deep 4 Inside Out 12 Waste Disposal 22 Command Center 24 Index 30 Glossary 31 Show What You Know 31 Websites to Visit 31 About the Author 32
Skin Deep Skin Deep Skin Deep The human body is a strange The human body is a strange and smelly thing of beauty and smelly thing of beauty Made of seventy-fi ve trillion Made of seventy-fi ve trillion microscopic cells our bodies can eat drink breathe sleep dream grow and heal Not to mention poop and pee You Are Mostly Bacteria About 95 percent of all the cells in the human body are bacteria Most of these microbes are in the digestive tract Billions of bacteria also live on human skin 4
Tiny Helpers Tiny Helpers Bacteria produce chemicals Bacteria produce chemicals that help us use energy that help us use energy and nutrients from food and nutrients from food Scientists think intestinal bacteria helps us maintain healthy immune systems 5
