The heart also contains valve's which ensure that the blood flows through the heart in the right direction

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The heart also contains valve's which ensure that the blood flows through the heart in the right direction
The cardiovascular system is the medical name given to the heart (cardio) and blood vessels (vascular) in the body.

Just like other organs and muscles in the body, the heart needs it's own blood supply to provide the heart with oxygen and other nourishing substances. These are carried to the heart by blood vessels called 'coronary arteries'.