Download Germ Wars!: The Secrets of Protecting Your Body by Melissa Stewart PDF

By Melissa Stewart

Explores the secrets and techniques of conserving fit in a clean, leading edge method.

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Extra resources for Germ Wars!: The Secrets of Protecting Your Body

Sample text

Police in the United States have used DNA evidence to investigate murders and other violent crimes for many years. In 2006, they began analyzing DNA evidence in less serious 40 crimes, including car thefts and house robberies. Criminals beware! From fighting crime and battling germs to keeping our eyes, ears, noses, and mouths safe and clean, it’s hard to believe all the ways our body’s builtin defense systems protect us every day. And we aren’t alone. Every living thing has its own loyal legion of dutiful defenders.

What do you do to get rid of the gooey gobs and slippery slime? You cough it out into the world. Cilia, such as the ones shown here in blue, line the surface of your throat. Hack Attack When you cough, air bursts out of your body at speeds of up to 760 miles (1,223 km) per hour. Sometimes people cough so hard that they break one of their ribs. Whenever you talk, eat, smile, or yawn, you open your mouth to the outside world. That gives particles in the air plenty of chances to float inside. But that’s not the only way tiny trespassers sneak into your mouth.

Ugh! What a mess! y n't barf ver o d ly b a b o You pr o. creatures d e m o s t u b often, An owl vomit s the it m o v le a h w A est ig d ’t n a c it ls materia week. a e c n o t u o b a s after ev e undigestib le parts o ry meal. All the f its prey— teeth—ge fur, bones t packed , i n t o a pellet hurled out a nd of its bod y. When an enemy attacks, a sea cucumber throws up its stomach. That’s enough to scare off most predators. Sometimes your stomach doesn’t notice germs, and they make it all the way to your intestines.

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