The amount of blood in a person’s body depends on how big he or she is, and surprisingly enough, on where that person lives.
For example, if you weigh about 80 pounds, you have about 2.5 quarts of blood in your body, while your 160-pound father has about five quarts, or twice as much. When you were an infant, perhaps about one month old, you had only about ten ounces of blood in your body.
If you live in high mountain areas where there is less oxygen in the air, you might have up to two more quarts of blood in your body. This additional blood is necessary to capture the extra oxygen your body needs to work and grow at greater altitudes.
