Immune response - The steps the body takes in other to protect it from pathogens , Can easily pass through blood vessel walls into the surrounding tissue  - Phagocytes, Vaccine - Give protection against serious diseases, Antibiotic - Substance that kills or stops growth of bacteria, Skin - Protects the body from physical damage, microbe infection and dehydration , Stomach acid - Hydrochloric acid kills harmful microorganisms that may be in things ingested , Natural passive immunity - Immunity passed on from mother to child which is temporary , Artificial active immunity - Use of vaccines , Disease - Any disorder affecting the body or mind that is not caused as a result of injury , Communicable disease - Can be transmitted from person to person or animal to person , First step of response - A phagocyte "eats" a bacteria , Fourth step of response - The helper T cell is activated , Helper T cell - When activated they divide and activate other cells, Killer T cell - They release enzymes directly into pathogen,

Microbes + The immune system

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