When something happens that could be harmful to your body, it has a system to protect you. This is called the immune system. It is made up of several organs in your body. Some provide external protection, and some work inside your body to protect you from foreign substances. They identify and then attack potentially harmful substances, like bacteria or viruses.
WHAT IS THE IMMUNE SYSTEM MADE OF?
The immune system refers to a collection of structures in our body. For example, the skin is part of the immune system. It acts as a physical barrier between substances in the environment and our internal organs.
Other physical barriers of protection include mucus in your nose and throat that substances will stick to so they don