What causes asthma?
select one:
a. bacteria that are resistant to antibiotics infect the body.
b. particular antigens trigger muscle contractions that make it difficult to breathe.
c. antibodies and cytotoxic t cells attack cells in the lining of the heart.
d. antibodies and cytotoxic t cells attack cells in the tissues of the lungs.

what causes asthma?
select one:
a. bacteria that are resistant to antibiotics infect the body.
b. particular antigens trigger muscle contractions that make it difficult to breathe.
c. antibodies and cytotoxic t cells attack cells in the lining of the heart.
d. antibodies and cytotoxic t cells attack cells in the tissues of the lungs.

how do some human white blood cells destroy pathogenic bacteria?
select one:
a. producing toxins that compete with bacterial toxins
b. inserting part of their dna into the bacterial cells
c. engulfing and digesting the bacteria
d. causing mutations in the bacteria

which of the following describes your immune system's specific defenses?
select one:
a. they respond to a general threat of infection.
b. they respond to a particular pathogen.
c. they include fever and inflammation of the infection site.
d. all of the above

the immune response produced by virus infected cells that other cells resist viral infection, and are often used in fighting other diseases, is known as
select one:
a. interferon.
b. an antigen.
c. a receptor protein.
d. an antibody.

which of the following is the body's most important nonspecific defense?
select one:
a. spleen
b. liver
c. skin
d. white blood cells

people that are allergic to bee stings can suffer a very serious reaction known as anaphylactic shock. this condition results from
select one:
a. mucous production and inflammation of the tissues of the nasal passages.
b. the production of antihistamines that prevent mast cells from transporting oxygen to other body cells.
c. delayed hypersensitive reaction to the allergen.
d. the release of histamine, which restricts breathing and affects blood pressure.

what is one effect of a fever?
select one:
a. it speeds up the growth of parasites.
b. it decreases the rate of chemical reactions.
c. it decreases the heart rate.
d. it slows or stops the growth of some pathogens.
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