Is oxygen-rich blood carried by veins or arteries?

Answer 1

Both. Veins lead to the heart whereas arteries go in the opposite direction. When a blood cell first enters the heart, it is deoxygenated or DO2. After it goes through the Superior Verna Cava (top of heart) or Inferior Vena Cava (bottom of heart) it goes into the right atrium, through the tricuspid valve, into the right Ventrical, passed the Chordae Tendonae (ring out the heart) into the pulmenary valve. There, it jumps to the pulmenary artery (leads away from heart) and goes to either the right or left lung. In the lung, it switches DO2 for O2 and goes through the pulmenary vein which leads to the left atrium, through the mitral valve, into the left ventical, passed the chordae tendonae, into the Septum, through the Perkinje fibers and the bundle of HIS where it goes to the Aorta. then, it either goes to the ascending aorta to spread to the arms and brain, or down to the descending aorta to spread to the legs and feet. The Pulmenary artery is the only artery in the whole body that carries DO2 and the pulmenary vien is the only vein that carries O2. otherwise, oxygenated blood is carried by veins.