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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.
Report Abuse. The human body has about 6 liters of blood. Some people have as few as 5, some have as much as 7, and some people may even fall outside that range. But the average is about six. Children have an average of 1.5 liters of blood, and infants have about 300 mililiters of blood. As for how much bloodloss is needed to kill a person, well.... that's rough. Some people's bodies are better at compensating than others.