Coronary arteries supply oxygenated blood to the heart muscle. Cardiac veins then drain away the blood after it has been deoxygenated.
coroNary arTerieS SupPlY oXYGenateD BLooD tO tHe hEArt muSCle. carDiAC veInS ThEN Drain aWaY the bloOD aFter it Has beeN DEoxyGENATEd.