Final answer:
The approximate blood volume of a 75-kg adult is about 6 liters, calculated as 8 percent of the body weight, which falls within the average range for an adult male and includes about 92 percent water content in the form of blood plasma.
Step-by-step explanation:
The approximate blood volume of a 75-kg adult can be determined using the knowledge that blood constitutes approximately 8 percent of adult body weight. Taking into consideration that an average male has about 5 to 6 liters of blood and a female has about 4 to 5 liters of blood, a 75-kg adult male on average would have approximately 6 liters of blood, given that males tend to have a slightly higher blood volume on average.
If one needs to be precise for an individual who weighs 75 kg, we can calculate the blood volume as 8 percent of the body weight, which in this case would be 0.08 x 75 kg = 6 kg of blood. Since the density of blood is close to that of water, 1 liter of blood weighs about 1 kg, thus the blood volume for a 75-kg adult would approximately be 6 liters.
Blood plasma, which makes up a little over half of this volume, is about 92 percent water and contains numerous proteins and other substances.