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the veins supply the heart and the heart pumps the blood around the body
If the blood supply to the heart muscles is blocked, a heart attack is likely.
The coronary blood supply is the arteries which supply the heart itself; in order for the heart to function it needs a good supply of oxygen just the same as any other organ/muscle. Without the coronary blood supply the heart would not be able to pump blood around the body, a disruption in this blood supply would cause a heart attack.
It's the coronary blood supply.
To provide the heart with a blood supply.
It depends on its location ,but generally it is less dangerous than an injured artery ,because usually there are other veins and anastomoses that can take the blood to the heart.
When blood supply to the heart is blocked what happens is a myocardial infarction which can result in death.
Blood
The heart purifies the impure blood and supply the pure blood to all the organs of the body
Veins. Veins carry unoxygenated blood towards the heart.
Oxygen to the heart.