Mark the following statements as true or false. If a statement is false, correct it to make a true statement.




d. The thymus is the site of maturation of B cells.

The red pulp areas of the spleen are sites ofa. splenic sinusoids, macrophages, and red blood cells,b. clustered lymphocytes,c. connective tissue septa.

Collections of lymphoid tissue (MALT) that guard mucosal surfaces include all of the following excepta. appendix follicles,b. the tonsils,c. Peyer's patches,d. the thymus.

Which of the following is/are the major lymphoid organ(s) that "train(s)" T lymphocytes to become immunocompetent?

Which of the following is NOT a role of the spleen?

The germinal centers in lymph nodes are largely sites ofa. macrophages,b. proliferating B lymphocytes,c. T lymphocytes,d. all of these.

In addition to its lymphoid function, which organ holds a reservoir of platelets?

Multiple ChoiceMore than one choice may apply.Where exactly does an antigen bind to an antibody molecule?a. b. c. d.

Once almost a rite of childhood, tonsillectomy (surgical removal of the tonsils) is now rarely performed. Similarly, while ruptured spleens were once routinely removed, they are now conserved whenever possible. Why should these lymphoid organs be preserved when possible?