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 in _________________ .
			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 ___________ cells.
			A)	helper cells
			B)	T cells
			C)	B cells
			D)	plasma cells
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			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 ______________.
			A)	spleen
			B)	lymph nodes
			C)	thymus
			D)	tonsils
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 ________________.
			A)	plasma cell
			B)	T cell
			C)	helper cell
			D)	monocyte cell
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 _________________.
			A)	common carotid a.
			B)	right subclavian vein
			C)	left subclavian vein
			D)	internal jugular vein
15			The thymus is located in the ___________________.
			A)	brain
			B)	abdomin
			C)	neck
			D)	mediastinum
16			The right lymphatic duct ___________________.
			A)	drains a smaller area than the left lymphatic duct.
			B)	drains a larger area than the left lymphatic duct.
			C)	drains an identical area as the left lymphatic duct.
			D)	drains only the upper limbs
17			Which cells attack and kill body cells infected with viruses, bacteria, or parasites?
			A)	helper cells
			B)	B cells
			C)	cytotixic T cells
			D)	plasma cells
18			What are antimicrobial proteins that are part of the non-specific defense in the immune system?
			A)	antioxidants
			B)	interferons
			C)	thymosin
			D)	crypts
19			The procedure to remove the spleen is called _________________ .
			A)	lithotripsy
			B)	splenectomy
			C)	omphalectomy
			D)	appendectomy
20			Diseases resulting from immune attack against the body's own tissues are due to ___________________.
			A)	hypersensitivity
			B)	viruses
			C)	autoimmune diseases
			D)	bacteria
21			Inflammation of a lymph node in response to antigen is called ________________________.
			A)	lymphoma
			B)	lymphadenitis
			C)	thrombocytopenia
			D)	rejection disease
22			The lymph normally does NOT contain ______________.
			A)	blood
			B)	clear, colorless fluid
			C)	fluid similar to blood plasma
			D)	fluid low in protein content
23			Lymph vessels often contain _________________.
			A)	blood cells
			B)	thrombocytes or platelets
			C)	valves
			D)	white blood cells
24			The lymphatic system normally returns ____________________ per day to the circulatory system's volume.
			A)	about 10 mLs
			B)	about 5 liters
			C)	about 180 liters
			D)	about 5,000 liters
25			The several vessels that lead into a lymph node are called ______________ vessels.
			A)	afferent
			B)	veinules
			C)	efferent
			D)	arterioles