question_answer 32)

  Transplantation of tissues/organs to save certain patients often fails due to rejection of such tissues/organs by the patient. Which type of immune response is responsible for such rejections?       (a) Auto-immune response                                         (b) Humoral immune response  (c) Physiological immune response                          (d) Cell-mediated immune response

Answer:

                    (d)Transplantation is the replacement of a diseased organ or tissue of an individual with healthy organ or tissue of same or another individual. These transplants or graft gets rejected if it is recognized as foreign antigen by the body's immune systems. Cell mediated immune response, mediated by T-lymphocyte in able to differentiate between self and non-self cells/organ. This type of immune response recognize the             body's non-cells or other tissue or organs from other individual as foreign antigen and cause rejection of the graft.