Approximately 5 liters of blood flow through the human body for men and 3~3.5 liters for women. [If you're wondering, yes, it's still 5 liters for women.] Blood supplies oxygen and nutrients to the body and removes waste products.
When a large amount of one's blood is lost at once, the body's supply of oxygen and nutrients stagnates, waste accumulates, and organ function is impaired, resulting in organ failure. This leads to shock symptoms and death. The result is known as exsanguination.
A person's life is in danger when about one-third of the blood in the body is lost, and death occurs when one-half is lost.
However, whether or not a person bleeds to death depends largely on the rate of bleeding. In the case of fast arterial hemorrhage, immediate intervention is necessary for survival, but in slower rates of bleeding, some people have survived despite the loss of even half their body's blood volume.
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