What is the main blood line in a human?

The main blood line in a human is the aorta. It is the largest artery in the body and carries oxygenated blood from the heart to the rest of the body. The aorta begins at the left ventricle of the heart and arches up and to the left. It then descends down the chest and abdomen, giving off branches to the head, neck, arms, and legs. The aorta ends in the pelvis, where it divides into the right and left common iliac arteries.