31) Lymphocytes attack antigens mostly in lymphoid organs (except the thymus) and in
A) loose connective tissue.
B) the bloodstream.
C) cartilage.
D) the thyroid.
32) In the spleen, lymphoid tissue is confined to the
A) red pulp.
B) white pulp.
C) trabeculae.
D) hilus.
33) Is it possible for lymphocytes to gain immunocompetence in the thymus of an 82-year-old person?
A) Yes, but the thymus has shifted to the production of B lymphocytes.
B) Yes, but fewer than in youth.
C) No, because the thymus has completely degenerated.
D) No, because all lymphocytes have turned into thymic corpuscles.
34) The immune system cell type that is preferentially destroyed by the Epstein-Barr virus in mononucleosis is the
A) B lymphocyte.
B) cytotoxic T lymphocyte.
C) helper T lymphocyte.
D) macrophage.
35) A bubo is
A) an infected lymph node containing a large number of pathogens that are trapped in the node but not destroyed.
B) a cancer-infiltrated lymph node.
C) any enlarged lymph node.
D) a structure that is unrelated to lymph nodes.
36) In humans, B lymphocytes originate in
A) the thymus.
B) the appendix.
C) all lymphoid tissue.
D) the bone marrow.
37) Which of the following cells are the largest producers of antibodies?
A) B lymphocytes
B) T lymphocytes
C) plasma cells
D) macrophages
38) The lymph trunk that contains chyle and is unpaired is the
A) intestinal.
B) subclavian.
C) jugular.
D) right lymph trunk.
39) Which of the following statements about the right lymph duct is
false?
A) Not all people have one.
B) This duct and its tributaries drain the superior right quarter of the body.
C) It empties into the thoracic duct.
D) It forms from the union of a jugular, subclavian, and bronchomediastinal trunk.
40) In a histological cross section through an artery, a vein, and a lymphatic vessel, one can recognize the lymphatic vessel because it
A) has the fewest valves.
B) has the thinnest walls.
C) has the thickest tunica media.
D) always lies closest to the artery, which has the thinnest walls.