The circulatory system is the heart and all the blood vessels in the body which carry cells and substances to all its parts. The heart is a large muscular organ which pumps blood to the lungs and ...

The circulatory system consists of one heart, five liters of blood ... receives carbon dioxide-laden blood for oxygenation in the lungs. Blood flows through arteries and veins, with valves ...

Come along children, we’ve come to the hospital to learn how blood is moved around the body in the circulatory system ... of the heart then pumps this oxygen-poor blood back to the lungs ...

Despite this variability, the structure of the heart and major vessels tells us ... These modifications revolve around change from gill to lung respiration and the evolution of the double circulatory ...

Medically reviewed by Susan Russell, MD Your lungs play a vital role in supplying oxygen to your body. When they are healthy, ...