question_answer 36)

  Which of the following is not a lymphoid tissue? (a) Spleen                           (b) Tonsils        (c) Appendix                                      (d) Thymus

Answer:

                  (c)Lymphoio organs are the organs where origin and/or maturation and proliferation of lymphocytes occur.     The secondary lymphoid organs provide the sites for interaction of Iymphocytes with the antigen, which then proliferate to become seffector cells. Appendix is sometime not considered as the lymphoid organ, as it has been proposed to be a vestigial structure connected to the cecum, located near the junction of the small intestine and the large intestine.