Blood supply. The coronary arteries provide the blood supply (oxygen & nutrients) to the heart.
Blood. Your heart (especially the left ventricle) is a thick muscle and needs a rich, constant supply of oxygen and nutrients. These are supplied by by the coronary arteries as the left ventricle is not able to absorb them from the blood pool inside the cardiac chamber.
Blood supply. It is the blood supply to the heart -- providing oxygen and nutrients.