Bio notes 13 - Notes Topic Immunity Biology 103 Dr Karen...

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Topic: Immunity Reading: Chapter 36 Main concepts : The immune system is our line of defense against disease and infection. Nonspecific responses consist of physical structures and barriers that resist invasion by bacteria and viruses (skin, mucus), and generalized internal responses such as inflammation, fever, and phagocytosis (phagos = eat, cytos = cell) by macrophages (literally “big eater,” a type of white blood cell). Specific defenses involve teamwork between white blood cells, where “team members” specialize in remembering invaders, hunting down and killing invaders, producing antibodies against invaders, or coordinating the efforts of the other “team members.” Specific immune response involves: Recognition of the invader: T cells are able to recognize the difference between “self” and “non-self.” Macrophages may “show” a scrap of suspect protein to a T cell to have it identified. If the protein is something new, the immune system will piece together antibodies to tag and disable the invader. B cells will produces the antibody in quantity. If it is something that has been seen before, B memory cells will produce the antibody that was produced the last time the invader was encountered. Cytotoxic T cells (“killer” T cells) attack the tagged invaders. T memory cells will remember the invader and recognize it if it invades again. T cells signal when the immune response should stop. Medical assistance to the immune response Antibiotics (do not confuse these with antibodies) can slow bacterial reproduction, or may cause the bacteria to make weak cell walls. Vaccinations use killed viruses or bacteria. Our immune system recognizes the protein as foreign and launches an attack, which ends quickly because the “invaders” are already dead. The immune system
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Bio notes 13 - Notes Topic Immunity Biology 103 Dr Karen...

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