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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.
Blood is mostly liquid, with numerous cells and proteins suspended in it, making blood thicker than pure water. The average person has about 5 liters (more than a gallon) of blood. A liquid called plasma makes up about half of the content of blood.