11) Splenic blood vessels and lymphatic vessels communicate with the spleen at the ________.

A) sinus

B) medulla

C) hilum

D) cortex

E) capsule

12) ________ are clusters of lymphoid nodules located beneath the epithelial lining of the intestines.

A) Adenoids

B) Lingual tonsils

C) Palatine tonsils

D) Vermiform appendices

E) Peyer patches

13) The wall structure of lymphatics and the flow of lymph through them are comparable to those of

A) elastic arteries.

B) arterioles.

C) the vena cava.

D) veins.

E) muscular arteries.

14) The greatest number of lymph nodes is located in which of the following?

A) mammary region

B) patellar region

C) lumbar region

D) axillary region

E) pelvic region

15) Which of the following is a primary function of the lymphoid system?

A) circulation of nutrients

B) transport of hormones

C) production, maintenance, and distribution of lymphocytes

D) production, maintenance, and distribution of plasma proteins

E) blocking the action of histamine

16) Lymph returns to the venous circulation by way of draining into the

A) right lymphatic duct.

B) subclavian veins.

C) inferior vena cava.

D) superior vena cava.

E) dural sinus.

17) Lymph nodes

A) collectively contain the largest collection of lymphoid tissue in the body.

B) are the site of T cell maturation.

C) stimulate lymphocyte stem-cell division.

D) purify lymph before it reaches the veins.

E) remove abnormal blood cells and components.

18) The white pulp of the spleen contains large numbers of

A) red blood cells.

B) lymphocytes.

C) eosinophils.

D) basophils.

E) antibodies.

19) Which of the following functions in immunological surveillance?

A) NK cells

B) helper T cells

C) plasma cells

D) B cells

E) regulatory T cells

20) The role of the spleen is slightly different than other lymph organs because it

A) produces antibodies.

B) produces memory cells.

C) filters blood.

D) filters lymph.

E) contains lymphocytes.