Chapter 21 Review

Which of these statements regarding lymph capillaries is false?

They have precapillary sphincters that regulate drainage of lymph from tissues.

Individuals infected with HIV acquire the virus through __________.

body fluids transmitted from an HIV infected individual

Lymphatic vessels perform all of the following functions except

carrying blood.

The thymus is most active during

childhood.

Which cell has the responsibility of presenting foreign antigens to lymphocytes?

dendritic cell

Lymph leaves a lymph node via

efferent lymphatic vessels.

Clusters of lymph nodes occur in all of the following sites except

in bones and bone marrow.

The tonsil located on the posterior surface of the tongue is the ________ tonsil.

lingual

Small, bean-shaped organs abundant in the cervical, axillary, and inguinal regions.

lymph nodes

Which of the following is not a part of MALT?

lymphocytes in the spleen

Masses of lymphoid tissue within a lymph node.

lymphoid follicles

Which lymphatic structure drains lymph from the right upper limb?

right subclavian duct

Recycles red blood cells and initiates immune responses.

spleen

The largest lymphoid organ.

spleen

Which of the following lymphoid structures have a hilum?

spleen and lymph nodes

In humans, T lymphocytes originate in

the red bone marrow.

Which of the following lymphoid organs does not directly fight antigens?

the thymus

Duct of the lymphatic system that drains the body's entire lower half.

thoracic duct

Blockage of the ________ duct would prevent drainage only from the ________ and lumbar trunks.

thoracic; intestinal