There's so much to learn about the circulatory system. This lesson explores the composition of blood, the various blood cells, and the different kinds of blood vessels in your body. Of course, the heart is a crucial part of the circulatory system, so you will learn about its chambers, valves, coronary vessels, and electrical system. You will learn how blood travels around the body and its important functions. You will finish this lesson knowing the importance of taking care of this organ system.