What is the average circulating blood volume for an adult human?

The average circulating blood volume for an adult human is approximately 5 liters. This volume typically represents about 7-8% of a person's total body weight and can vary based on factors such as body size and composition. Blood plays a crucial role in transporting oxygen, nutrients, hormones, and waste products throughout the body, maintaining homeostasis, and regulating body temperature. Understanding the average blood volume is important in clinical settings, particularly for assessing blood loss, administering medications, and evaluating fluid status during medical treatments.