Microbiology and Immunology 2500A/B Lecture : Immunology Notes Summers.docx

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Number of pathogens that cause serious human infections: Whenever you have a cut, immune system help to form scabs, fibrosis, and we get inflammation. Another role: removing dead tissue cells, so we can"t get development of autoimmune diseases from damaged tissue cells. If no immune system, we would only survive for a few days because of wound, infections. If that bacterium is a external threat, is it going to develop infection, or is it microbiota. They don"t cause diseases, just allergic reaction for some people who are sensitive to the allergens. All cells in our body have a certain life span. Over time, they become damaged, can"t function properly. They are destroyed by the process of apoptosis-cell"s committing suicide, in a regularly manner. It"s very controlled cell death, a normal part of your cells" life span. They multiply very rapidly, they don"t undergo apoptosis; they don"t die, just keep multiplying and growing.

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