BPK 140 Lecture Notes - Lecture 2: Escherichia Coli, Cervical Cancer, Anal Sex

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The immune system & infectious disease: risk & responsibilities. Includes physical and chemical barriers: born with it, skin, acid in stomach. Acquired immunity: able to recognize specific foreign substances and react selectively to them, also able to retain a memory of the pathogen, gain it over your lifetime. Macrophages: phagocytes (destroy antigens by eating them, display antigen fragments on their cell surface to activate other immune cells, eat bacteria. Involved in activating other immune cells, secreting chemicals, and attacking and destroying pathogens: produced in bone marrow, activate other immune cells, ex. Cd4: helper t cells: hiv and aids, ex. Cd8: killer/cytotoxic t cells: kill cells that are infected by the pathogen. B lymphocytes: secrete antibodies, bind to antigens, labeling them for other immune cells to recognize and destroy, are unique for each different antigen, bone marrow, antibodies bind to virus. Memory cells: have a longer lifespan, allow immune system to remember antigens that it has already been exposed to.

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