Please answer all questions

1		Each nodule of a lymph node contains a sinus filled with __________.
			A)	lymphocytes
			B)	macrophages
			C)	both A and B
2		The spleen's purpose is to __________.
			A)	filter lymph of impurities
			B)	filter blood of impurities
			C)	both A and B
3		A spleen nodule contains __________.
			A)	red pulp with blood cells and macrophages
			B)	white pulp with lymphocytes
			C)	both A and B
4		The thymus secretes __________ that is believed to help T lymphocytes mature.
			A)	thyroxin
			B)	leukocytes
			C)	thymosin
			D)	epinephrine
5		The nonspecific defenses include ______.
			A)	natural killer cells
			B)	barriers to entry
			C)	inflammatory reaction
			D)	complement and interferon
			E)	all of the above
6		Monocytes differentiate into __________.
			A)	amoeboid cells
			B)	neutrophils
			C)	macrophages
			D)	microphages
7		Complement is activated when __________ enter the body.
			A)	antibodies
			B)	pathogens
			C)	red blood cells
			D)	enzymes
8		A virus-infected cell produces and secretes __________.
			A)	antigen
			B)	exon
			C)	interferon
			D)	histamine
9		B cells give rise to plasma cells, which produce __________.
			A)	antibodies
			B)	antigen
			C)	erythrocytes
			D)	memory cells
10		The shape of receptors on lymphocytes is complementary to a specific __________.
			A)	antibody
			B)	antigen
			C)	complement protein
			D)	lymphocyte
11		__________ antibodies are responsible for allergic reactions.
			A)	IgM
			B)	IgG
			C)	IgC
			D)	IgE
12		In order to recognize a nonself antigen, T cells must have the assistance of ____________.
			A)	antibodies
			B)	antigen-presenting cells
			C)	complement proteins
			D)	interferon
13		Cytotoxic T cells attack and destroy __________-bearing or abnormal body cells.
			A)	histamine
			B)	antigen
			C)	B-cell
			D)	antibody
14		Cytotoxic T cells and memory T cells are involved in _________________.
			A)	antibody-mediated immunity
			B)	nonspecific body defenses
			C)	cell-mediated immunity
			D)	all of these are correct
15		When exposed to an antigen, helper T cells enhance the response of other immune cells by secreting __________.
			A)	IgM
			B)	MHC
			C)	cytokines
			D)	histamines
16		Active immunity is dependent upon the presence of ___.
			A)	memory B cells
			B)	memory T cells
			C)	lymphocytes
			D)	memory B cells and memory T cells
17		Substances that contain an antigen to which the immune system responds are called ________.
			A)	vaccines
			B)	medications
			C)	immunoglobulins
			D)	mast cells
18		Presently, monoclonal antibodies may be used in ___.
			A)	detecting pregnancy
			B)	identifying infections
			C)	both A and B
19		Human illnesses caused by an attack on tissues by the body's own antibodies and T cells are called _________.
			A)	antibody diseases
			B)	autoimmune diseases
			C)	allergic reactions
			D)	allergen diseases