20. The Lymphatic System

The germinal centers in lymph nodes are largely sites of:

a. Macrophages

b. Proliferating B lymphocytes

c. T lymphocytes

d. All of these

Which of the following statements about the spleen is true?

A friend tells you that she has tender, swollen 'glands' along the left side of the front of her neck. You notice that she has a bandage on her left cheek that is not fully hiding a large infected cut there. Exactly what are her swollen 'glands,' and how did they become swollen?

The lymphoid organ that filters the blood is the ______, and the lymphoid organ that filters the lymph is the______.

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.

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.

More than one choice may apply.

Developmentally, embryonic lymphatic vessels are most closely associated with the

a. Veins

b. Arteries

c. Nerves

d. Thymus gland

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

Red blood cells that are damaged or defective are removed from the bloodstream by the

(a) Thymus

(b) Lymph nodes

(c) Spleen

(d) Tonsils