What Is It??
The immune system, which is made up of special cells, proteins, tissues, and organs, defends people against germs and micro organisms every day. In most cases, the immune system does a great job of keeping people healthy and preventing infections. But sometimes problems with the immune system can lead to illness and infection! Sooo basically the immune system fights off bactiria, sickness and other things, it is sort of your best friend!!! :)
