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Question: Ted is a cyclist on the Tour de France. One year ago, his hematocrit was...

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Ted is a cyclist on the Tour de France. One year ago, his hematocrit was 45%. Now, his hematocrit is 50%. Which of the following statement is TRUE?

Question options:

Ted probably has anemia.

Ted may have taken erythropoietin (EPO) in the past year.

The resistance of Ted's blood flow is decreased compared to a year ago.

Ted's red blood cells concentration is reduced compared to a year ago.

The viscosity of Ted's blood is reduced compared to a year ago.
science   Anatomy-And-Physiology   
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Answer #1

Hematocrit is defined as the volume of red blood cells in total volume of blood. Anemia is a condition of decreased levels of hemoglobin. Increase of hematocrit of Ted from 45 to 50% increases the blood viscosity. This is because, increased hematocrit contributes the viscosity. less is the hematocrit, the blood viscocity is decreased and blood is diluted. Increased blood viscosity increases the resistance of blood flow. Therefore, the factor contributing to increased hematocrit of Ted would be administration of erythropoietin. Thus, option 2 is correct.

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