Question

why pcv is more in venous blood than arterial blood

Answer 1

A person's hydration status may have an impact on hematocrit. The percentage of red blood cells increases as the body's water content lowers. In addition, research shows that venous blood has a slightly higher hematocrit than arterial blood.

More reasons why pcv is more in venous blood than arterial blood:

• The venous serum HCO3 concentration is around 1 to 2 meq/L higher and the pH is about 0.002 to 0.04 pH units lower.

• Due to chloride shift, one Cl- or one Na+ ion enters the red blood cell when CO2 is present. As a result, the size of RBCs increases with a slight drop in plasma per CO2-loaded RBC.

• Second, some venous plasma enters the lymphatics without going via the bloodstream.

• As a result, venous blood's Hct increases by around 3% more than arterial blood's.

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