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.
So as you go down along the artery it gets smaller and carries less and less blood as it branches. The major veins in the body carry de-oxygenated blood back from the circulation towards the right side of the heart. The pulmonary veins are the exception as they carry oxygenated blood from the lungs to the left heart. They join together to form larger and larger veins as they gather from the periphery toward the larger veins.