diagram of circulatory system stock videos & royalty-free footage Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the ...

Browse 50+ circulatory system labeled diagram cartoon stock illustrations and vector graphics available royalty-free, or start a new search to explore more great stock images and vector art. Cute ...

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 ...