Final answer:
The average adult male has about 5 to 6 liters of blood, and adult females average 4 to 5 liters. Blood is composed of blood plasma and cells, with plasma being the major constituent.
Step-by-step explanation:
The average adult has a varying amount of blood depending on several factors, including gender. Generally, adult males have about 5 to 6 liters of blood, while females have slightly less, averaging between 4 to 5 liters. Blood consists of blood plasma and blood cells, with the former making up more than half of its volume. Plasma, which is about 92 percent water, contains a mixture of substances, predominantly proteins, along with hundreds of other substances in smaller quantities. The total blood volume is approximately 8 percent of an adult's body weight.