HLSC 1F90 Lecture Notes - Lecture 20: Gastrointestinal Tract, Neutrophil, Macrophage
27 Mar 2016
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Document Summary
Physiological mechanisms that humans and other animals use to defend their bodies from invasion by other organisms (but without harming themselves). A disease does not afect you or you are untouched by it. They reproduce and evolve much more rapidly than their human hosts. Cells dedicated to the defence of the human body. Minor infections can take hold and prove fatal. Children born without a functional immune system die in early childhood from the efects of common infections. The immune system takes time to build up its strongest response to an invading microorganism, time during which the invader can multiply and cause disease. To provide immunity, the immune system but irst battle with the microorganism. When populations face a new infection, the outcome is. The indigenous americans were killed in large numbers by the. A procedure whereby severe disease is prevented by prior exposure to the infectious agent in a form than cannot cause disease.
