Here is a 3 paragraph, 300-word essay on how the human body continuously needs blood supply:
The human body requires a constant supply of blood to function properly. Blood carries oxygen and nutrients to all parts of the body and removes waste products such as carbon dioxide. Without a continuous circulation of blood, our cells and organs would not receive the nutrients they need to survive and function.
The heart pumps blood through a closed system of arteries, veins and capillaries called the circulatory system. With each heartbeat, blood is pumped from the heart through the arteries and delivers oxygen and nutrients to tissues throughout the body. The smallest blood vessels, called capillaries, allow for the exchange of oxygen, nutrients, hormones and waste between the