Pyrogens are produced by phagocytic white blood cells in response to infection. Pyrogens
A) increase the concentration of iron in the blood.
B) relax the smooth muscle of arterioles delivering blood to the site of infection.
C) initiate an increase in body temperature.
D) are the chemicals that triggers an inflammatory response.
E) kill bacteria by digesting their cell walls.
C
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Why might these species be the first to recover?
a. Grasses were not eliminated by the fire, prairie dogs and antelope have mobility. b. Grasses have a short generation time, as do prairie dogs and antelope. c. Grass reproduction is stimulated by fire, and prairie dogs and antelope both feed on grasses. d. None of the above.
Which substance usually undergoes tubular secretion?
a. salts b. water c. glucose d. H+ e. urea
The main problem for sufferers of cystic fibrosis is
A. abnormal hemoglobin. D. missing DNA repair enzymes. B. elevated levels of cholesterol. E. formation of cysts in kidneys. C. mucus blocking ducts of glands.
The symptoms of malaria are
A. jaundice B. headaches and nausea C. abdominal cramps D. diarrhea and dehydration E. alternating chills and fever