Human beings have two interconnected blood circulation systems. Blood is crucial for human survival, and the average amount of blood varies depending on a person's size and weight. The circulatory system supplies oxygen and nutrients to organs and tissues, while also removing waste. This system is responsible for pumping blood through the body, delivering oxygen to various organs and cells. In total, the average adult human has 5-7 liters of blood circulating in their body, which is pumped through the circulatory system by the heart. With each heartbeat, around 80 milliliters of blood is pumped into the main artery, resulting in approximately 5 liters of blood being circulated every minute. This complex system of blood vessels and pumping action allows the body to function and carry out vital processes.