The important part of that system is that it protects you from an, illness, or any other things. The Blood cells do their Job In order to protect you from an illness, virus. The immune system is a fighting system of blood. The immune system has a role: It protects you from harmful germs. It has a Function that is Unique in it’s Own Way. Explanation:
As a kid your heart is about he size of one fist however as you grow it gets to be about the size of two fists put together so a cantaloupe for an adult and a fist for a child.
