Higher viscosity of blood will increase the amount of stress placed on the heart while it is pumping. Viscosity of blood is highest when .

A) hemoglobin levels are lowest
B) plasma levels are highest
C) hematocrit is highest
D) HbA1C levels are lowest

C) hematocrit is highest

Explanation:

The viscosity is the property of the fluid substance related to the flow of the resistance. The flow of the resistance increases when the amount of content in the fluid increases.

The flowing blood contains the water and the other components like the cells and proteins therefore it also exhibit the viscosity. The viscosity in blood happens when the cells and molecules interact with each other therefore measure of these components indicated about the viscosity of the blood.

The hematocrit is the ratio of the proportion of the red blood cells present in the blood to the total volume of the blood. The viscosity of blood, therefore, increases when the hematocrit is high and decrease when the hematocrit component is low.

Thus, Option-C is the correct answer.