Final answer:
The average adult body contains about 5 to 6 quarts of blood, varying slightly between males and females and constituting about 8 percent of body weight. Blood is composed of cells and a fluid called plasma.
Step-by-step explanation:
The average adult body contains approximately 5 to 6 quarts of blood. Adult males typically average about 5 to 6 liters of blood, while females average 4 to 5 liters. This volume accounts for about 8 percent of an adult's body weight. The blood is composed not only of cells but also of a fluid called blood plasma, which is about 92 percent water and includes proteins and various other substances.