Scenario 2 IB Bio
Updated: 6/12/2020
Scenario 2 IB Bio
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  • Ali Gohar
  • Scenario 3: The Flu
  • I'm so sorry.
  • You opened my wound and the contents got into my wound.
  • The third line of defense for the body is specific resistance. This scenario explains the body's defense after the first and second defense have failed.
  • The third line of defense of the body is a defense against antigens. Antigens are substances in the pathogens. Antigens give the body a reason to respond to pathogens. If an antigen is detected the body's T- Cells are activated.
  • The antigens of the pathogens are detected by the macrophages which then goes through phagocytosis. The pathogen is then trapped in the internal vesicle. The human body contains millions of T- Cells and each T- Cell is able to respond to a specific antigen.
  • Oh it's clotting up
  • The body's immune response uses T- Cells and B cells to recognize and kill microbes. When T- cells stimulate b- cells to divide the process forms plasma cells. Plasma cells form antibodies and memory b- cells. Antibodies are a type of protein that are in the shape of a Y that attack microbes by attaching to specific antigens.
  • Many different T- Cells have different functions. One type is the helper T- cells, they employ more cells to help fight the pathogens. Some other are killer T- Cells and suppressor T- Cells. The killer T- cells kills all foreign cells. Suppressor, T- cells adjust the immune system and prevent autoimmune disease.
  • B- Cells are a type of white blood cell that fight bacteria by crating more antibodies. They can form cells like a memory b-cell that remembers a pathogen. If a pathogen that is already known by the b-cell appears the b-cell will be able to produce more antibodies at a faster rate to combat the pathogen. Finally, the process of antigen attaching to a T- cell that have specific receptors of that antigen is called clonal selection.
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