Explain how external defence mechanism protects our body from different types of infections

External Defense Systems:- 

The first lines of defense for your body are the external defense systems. These are the parts of your body designed to protect you from harmful outside agents by preventing them from getting into your body in the first place. Sometimes this can be a little confusing because, scientifically, there are several places you might think of as internal that are considered by biologists to be external. Your skin is external, so that's an easy one. But did you know that your stomach is external, too? Nasty stuff can be eaten by you and pass through your entire digestive _____ ____ ________ ____ ______ _______ _________.
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