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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.
Most sources state the volume of blood in an average human adult, who is between 150 to 160 pounds, as between 4.7 and 5 liters (around 5 quarts), although the more recent sources state the volume of blood in an average adult as 4.7 liters.