Choose the best answer.

1			What are the main antigen-presenting cells in the body?
			A)	neutrophils
			B)	helper T cells
			C)	plasma cells
			D)	macrophages
2			An example of where MALT is found is
			A)	the spleen.
			B)	the thymus.
			C)	the bone marrow.
			D)	the respiratory tract.
			E)	the lymph nodes.
3			Which statement about larger lymphatic vessels is incorrect?
			A)	They have thicker walls than veins.
			B)	They have valves.
			C)	The tunica media has smooth muscle and elastic fibers.
			D)	The tunica externa is relatively thin.
4			The cells destroyed by the HIV virus are plasma cells.
			A)	True
			B)	False
5			Which of the following is associated with specific immunity?
			A)	vaccination
			B)	fever
			C)	mucous membranes of the respiratory tract
			D)	lysozyme
			E)	inflammation
6			Where do T cells become immunocompetent ?
			A)	in the spleen
			B)	in the bone marrow
			C)	in the yolk sac
			D)	in the lymph nodes
			E)	in the thymus
7			Which of the following is not an autoimmune disease?
			A)	elephantiasis
			B)	systemic lupus erythematosus
			C)	rheumatic fever
			D)	diabetes mellitus
			E)	rheumatoid arthritis
8			The germinal centers are located in the spleen.
			A)	True
			B)	False
9			Which statement is not true of lymphatic capillaries?
			A)	They are lined with endothelial cells that are joined with tight junctions.
			B)	They are closed at one end.
			C)	They are more permeable than blood capillaries.
			D)	Gaps between endothelial cells permit lymphocytes to pass.
			E)	There is no continuous basement membrane in the wall.
10			Which of the following is not a function of the lymphatic system?
			A)	It returns excess fluid from tissues to the blood.
			B)	It returns proteins to the blood.
			C)	It provides immunity.
			D)	It transports nutrients to tissues.
			E)	It absorbs dietary lipids.
11			What region does not have a concentration of lymph nodes?
			A)	cervical region
			B)	gluteal region
			C)	axillary region
			D)	groin
			E)	popliteal region
12			Before a B lymphocyte can secrete antibodies it must transform into a plasma cell.
			A)	True
			B)	False
13			Which lymphocytes recognize and destroy tumors in a non-specific fashion, without requiring prior exposure to antigens?
			A)	plasma cells
			B)	natural killer cells
			C)	macrophages
			D)	B cells
14			The thoracic duct empties into the right subclavian vein.
			A)	True
			B)	False
15			The thymus is located in the mediastinum.
			A)	True
			B)	False
16			The right lymphatic duct drains the lower limbs.
			A)	True
			B)	False
17			The thymus and spleen are lymphatic organs that have a cortex and a medulla.
			A)	True
			B)	False
18			Helper T cells attack and kill body cells infected with viruses, bacteria, or parasites.
			A)	True
			B)	False
19			Lymphatic capillaries are also called terminal lymphatics.
			A)	True
			B)	False
20			Interferons are antimicrobial proteins that are part of specific defense.
			A)	True
			B)	False
21			The procedure to remove the spleen is called splenomegaly.
			A)	True
			B)	False
22			Diseases resulting from immune attack against the body's own tissues are due to hypersensitivity.
			A)	True
			B)	False
23			Inflammation of a lymph node in response to antigen is called lymphoma.
			A)	True
			B)	False