The Immune System

Hey, guys! Welcome to this Mometrix video about the immune system. Think of the immune system as the body’s gladiator. It fights for us, defends us, and protects us. The immune system fights off pathogens, the viruses and bacteria that seek to invade our body. It defends us by sending out armies of disease-fighting cells when it senses an intrusion. And the immune system protects us in natural and artificial ways.

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