Suppose that an individual injects himself with erythropoietin in order to raise his level of endurance, an act that is usually illegal in competitive sports. Which of the following could result?
A. decreased blood viscosity
B. a lower hematocrit
C. polycythemia
D. reduced tendency for blood to clot
Answer: C. polycythemia; Erythropoietin causes an increase in release of erythrocytes, which, unless regulated, can induce polycythemia. EPO increases the hematocrit and the red cell mass and can lead to increased viscosity of the blood and an increased tendency to form clots.
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