Read more about causes of Metastatic cancer. More information about causes of Metastatic cancer: 1  Metastatic cancer as a complication caused by other conditions. 2  Metastatic cancer as a symptom.
When your heart's left ventricle (one of the four chambers of the heart) pumps blood into the aorta (the largest artery in the body), the first muscle to receive the oxygen-rich blood is your heart itself. It receives this blood through the coronary arteries on the surface of the heart.
These are the arteries responsible for supplying your heart with blood. Why doesn't the heart act like an opportunist and just take its oxygen straight from the blood that's constantly passing through its chambers? There are two important reasons. First, not all of the blood in the heart has oxygen.