The cardiovascular system is a set of body organs that carry out the correct circulation of the blood. It's made up by the heart, the capillary vessels, and the blood.
These organs interact with each other media the blood traveling through them, and they're subdivided into two main systems: a systemic one, and a pulmonary one.
We could mention that regarding the blood, it's composed also of red cells for example. and these important components carry out oxygen to all our bodies.