Please answer all questions.

1			The lymphatic system is an ancillary circulatory system of blood vessels that delivers nutrients and removes wastes from tissues.
			A)	True
			B)	False
2			Lymphatic vessels contain elastic fibers and valves.
			A)	True
			B)	False
3			The right lymphatic and thoracic ducts drain about an equal area of the body.
			A)	True
			B)	False
4			Bacteria cannot enter the blood from a wound in the skin as long as no bleeding is evidenced.
			A)	True
			B)	False
5			The function of the lymphatic system is to transport proteins, and other particles to the circulation where they are identified by defense cells.
			A)	True
			B)	False
6			Breathing helps facilitate return of lymph by creating a positive pressure in the thoracic cavity.
			A)	True
			B)	False
7			Thymosin is a hormone that stimulates the development of thymocytes into all lymphocyte types.
			A)	True
			B)	False
8			T lymphocytes can be found in the bone marrow, spleen, blood, and tonsils as well as thymus gland.
			A)	True
			B)	False
9			The sinuses of the lymph nodes and spleen are cavities filled with blood.
			A)	True
			B)	False
10			The spleen always stops its hematopoietic activity at birth.
			A)	True
			B)	False
11			Macrophages are specialized lymphocytes that engulf foreign particles.
			A)	True
			B)	False
12			Tears contain lysozyme enzymes that can destroy bacteria.
			A)	True
			B)	False
13			Inflammation is a nonspecific defense mechanism that is caused by any cell damage.
			A)	True
			B)	False
14			Mucous membranes provide a barrier to infection mainly because of its phagocytic properties.
			A)	True
			B)	False
15			A macrophage could belong to the lymphatic and reticuloendothelial systems at the same time.
			A)	True
			B)	False
16			All phagocytes belong to the nonspecific mechanisms of defense.
			A)	True
			B)	False
17			The origin of the B cells is the bone marrow.
			A)	True
			B)	False
18			A clone is a group of cells with identical genetic properties.
			A)	True
			B)	False
19			The area designated the constant region of the immunoglobulin will bind to the antigen.
			A)	True
			B)	False
20			Immunoglobulin E can produce allergic or inflammatory reactions that are life threatening.
			A)	True
			B)	False
21			B cells usually require the presence of some activating factor before they can recognize an antigen.
			A)	True
			B)	False
22			Neutralizing antibodies cause antigens to lose their toxic properties.
			A)	True
			B)	False
23			T cells produce factors that stimulate the activity of other cells including B cells.
			A)	True
			B)	False
24			The delayed reaction allergy to a chemical is mediated by the B cell system.
			A)	True
			B)	False
25			The HIV viruses cause death from conditions such as pneumonia.
			A)	True
			B)	False
26			Immunosuppressive drugs can be used to suppress the histocompatibility complex reaction in a tissue organ or graft rejection.
			A)	True
			B)	False
27			SLE is an autoimmune disease, which attacks body tissues because of a T cell activation.
			A)	True
			B)	False
28			Lymphatic vessels contain valves to allow for one-way movement of fluid.
			A)	True
			B)	False
29			Thymosin is an enzyme required to stimulate T-cell production in the spleen.
			A)	True
			B)	False
30			T-cell lymphocytes die if they are NOT capable of recognizing foreign particles.
			A)	True
			B)	False
31			The lymphatic system can either cause or cure a cancer.
			A)	True
			B)	False
32			Removal of the spleen will impair the immune capabilities of the individual.
			A)	True
			B)	False
33			Pus is a collection of white blood cells, cellular debris, and bacteria.
			A)	True
			B)	False