17 to 20 17) Whic h cells become activated only if the antigen appears in the bo
ID: 277767 • Letter: 1
Question
17 to 20
17) Whic h cells become activated only if the antigen appears in the body at a later date? A) helper T cells B) regulatory cells C) macrophages D) memory B cells E) cytotoxic T cells 18) Lymphocytopoiesis is the production of lymphocyte s and it occurs in both the bone marrow and he A) spleen B) liver C) thymus D) lymph nodes E) thyroid ? --19) Lymphoid nodules in the walls of the small intestine are called A) germinal centers B) thymic corpuscles C) nodes D) mucosa aggregated lymphoid tissue E) lingual tonsils 20) Which of the following is a lymphoid function of the spleen? A) production of B and T cells B) maturation of T cells C) phagocytosis of damaged or infected cells circulating with the blood D) addition of many new NK cells to the circulation E) filtration of lymph 21) The matrix of the blood, which made of primarily water, is called plasma.Explanation / Answer
17. Memory B cells activation occurs following exposure to a particular antigen and only if the antigen appears in the body at a later stage. Hence optin D is the correct answer.
18. Lymphopoiesis takes place in at least thtee sites - the bone marrow, central lymphoid organs and peripheral lymphoid tissues. Thymus is the central lymphoid organ, hence option is C is the correct answer.
19. Mucosa aggregated lymphoid tissue - these are clusters of lymphoid nodules in the mucosal lining of small intestine and Appendix. Hence option D is the correct answer.
20. THe immunological function of spleen is primarily directed against bloodborne antigens. Hence option C is the correct answer.
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