Polycythemia Is a Disease Characterized by an Abnormally High Number

Polycythemia is a disease characterized by an abnormally high number of red blood cells.This makes the blood thick,hard to pump,and tends to clog up the vascular system.Athletes sometimes try to mimic this by an illegal practice in an attempt to boost oxygen delivery.This practice is called ________.

A) blood doping
B) leukemia
C) bloodletting
D) bone marrow transplant

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