On average, how many quarts of blood does an adult of average age and size have?

An adult of average age and size typically has about 5 to 6 quarts of blood in their body. This average amount can vary based on factors such as size, weight, and overall health. Blood volume is critical for transporting nutrients, oxygen, and waste products, as well as regulating body temperature and pH balance.

The choice of 6 quarts reflects a general understanding of the upper range of average blood volume for adults, accounting for variations in physiology. The other options fall below or above this standard understanding. Therefore, selecting 6 quarts aligns with the common knowledge regarding adult blood volume in medical and scientific contexts.