Chapter 22: The Lymphatic System & Immunity

Compared to blood capillaries, lymph capillaries exhibit all of the following except that they

are smaller in diameter.

The medulla of a lymph node contains ________ lymphocytes and macrophages.

B

________ are clusters of lymphatic nodules deep to the epithelial lining of the small intestine.

Peyer's patches

________ are large lymphatic nodules that are located in the walls of the pharynx.

Tonsils

**The term lymphadenopathy refers to

a chronic or excessive enlargement of lymph nodes.

All of the following are true of the thymus gland except that it

activates B Cells

Lymphatic capillaries are known for all of the following except

allowing nutrient gas exchange

The primary function of the lymphatic system is

defending the body against both external and internal threats

Which class of cells is particularly abundant in the red pulp of the spleen?

macrophages

**Lymph nodes do all of the following except

remove excess nutrients from the lymph

T Lymphocytes are produced and stored in all of the following except

the brain

The lymphatic system is composed of all of the following except

the venae cavae

Lymphatic organs differ from lymphatic tissues in what way?

they are surrounded by a fibrous capsule and lymphatic tissues are not.

Most of the lymph returns to the venous circulation by way of the

thoracic duct

The lymphatic system does all of the following except

transports gases to and away from lymph nodes.

Areas of the spleen that contain large aggregations of lymphocytes are known as

white pulp