The Incredible Immune System
The germs won't get past this!
What is the immune system?
The immune system is basically the defencive system of your body. It fights off germs and keeps your body healthy and strong.
What it does
The first is the skin: It keeps out lot's of the germs, like a wall. But if the germs enter your mouth or nose or ear, they get trapped in the nose hairs, melted by saliva or stuck in earwax. (gross, much?) There are stomach acids that kill germs, too. But some of them are sneaky and enter your bloodstream. White blood cells, called leukocytes call up good germs to eat the bad ones.