The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic).

Learn about the anatomy of the heart and how its chambers, valves, and vessels work together to maintain effective blood circulation throughout the body to sustain life.

Your circulatory or cardiovascular system serves a vital function by delivering oxygen and nutrients to all the organs and tissues of your body. Learn more about how the circulatory system works ...

What are the main arteries of the body? Illustrations and lists breakdown this major part of your circulatory system.

Medically reviewed by Jeffrey S. Lander, MDMedically reviewed by Jeffrey S. Lander, MD The cardiovascular system, also known as the circulatory system, includes the heart and blood vessels. It plays ...