Here’s how it works. The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal ...

Let’s follow the blood on a simple loop through the circulatory system to see how it works: Atherosclerosis can gradually make the arteries narrower, affecting the amount of blood that can flow ...

Together, the heart, blood, and blood vessels — arteries, capillaries, and veins — make up the circulatory system. In this article, we explore the structure of the heart, how it pumps blood ...