Inflammation Altered Immunity and Infection Questions and Correct Answers

Function of T-Cells (T-lymphocytes) Ans governs cell mediated immunity/response T-cytotoxic cells (T8, CD8, killer Ts) Ans kill virus infected cells, tumor cells, and allograft cells by releasing cytotoxic chemicals T-Help cells (T4) Ans Activate other CD4 cells. Release lymphokines that begin the inflammatory process and mediate delayed hypersensitivity reactions (TB skin test) NK killer cells Ans Contain granules that attack and kill virus-infected or cancerous cells active aquired immunity Ans obtained after exposure to an antigen, improves with repeat exposure and is specific. produced by the host after exposure to an antigen or immunization. passive aquired immunity Ans acquired via the transfer of antibodies, or t cells to the recipient. can be natural or artificial. Natural: from mother to fetus via breast milk or through placenta artificial: antibodies are given to recipient to provide immunity, immunity only lasts as long as the antibodies humoral immunity Ans produced by B cells. provides immunity against some viral infections, toxin induced disease, and disease caused by pneumococci, meningococci, and haemophilus cell-mediated immunity Ans produced by T cells. Immunity is active against cells infected with intracellular bacteria or viruses. Defends against cancer, fungal infections, parasitic infections, tumors, and is responsible for organ transplantation rejection Immune system components Ans bone marrow, thymus, spleen, lymph nodes, tonsils, and peyer patches Bone marrow function in immune system Ans responsible for production of immune cells and the maturation of B cells Thymus function