Final answer:
An average human adult has approximately 5 to 6 liters of blood for males and 4 to 5 liters for females, with blood plasma being a major component.
Step-by-step explanation:
The average adult human body holds about 5 to 6 liters of blood for adult males and approximately 4 to 5 liters for adult females. Blood accounts for roughly 8 percent of an adult's body weight. The blood is composed of both fluid, which is more than half of its volume, and cells. The fluid part of the blood is known as Blood Plasma, which is about 92 percent water, containing proteins and hundreds of other substances necessary for body function. Understanding the volume and composition of blood is critical for comprehending the circulatory system, which is essential for sustaining life as it performs various functions, including transporting oxygen and nutrients.