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About 55% of blood is blood plasma, a fluid that is the blood's liquid medium, which by itself is straw-yellow in color. The blood plasma volume totals of 2.7â3.0 liters (2.8â3.2 quarts) in an average human.
For components of blood, one unit is the amount of that substance that would normaâ¦lly be found in one unit of whole blood. The adult human body contains roughly 12 units of whole blood.0.45 litre = 1 unit of blood   Answer   According to Canadian Blood Services, a unit of blood is approximately 450 ml.