20. The Lymphatic System

Stem cells responsible for lymphocytopoiesis are located in:

(a) The thymus and spleen

(b) The lymph nodes

(c) The red bone marrow

(d) All of these structures

Carla presents to her physician with a complaint of swollen axillary lymph nodes. Her physician performs a breast exam and finds a tumor on the same side as the swollen nodes.

a. Explain what process has likely caused her nodes to swell.

Compare the structure and functions of a lymph node to those of the spleen.

The red pulp areas of the spleen are sites of:

a. 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 except:

a. Appendix follicles

b. The tonsils

c. Peyer's patches

d. The thymus

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

The thymus is the site of maturation of B cells.

The germinal centers in lymph nodes are largely sites of:

a. Macrophages

b. Proliferating B lymphocytes

c. T lymphocytes

d. All of these