- William travels through the heart, from the pulmonary artery to the lungs to pick up some oxygen.
William heads back to the heart through the pulmonary vein with a plane full of o2, before he has a moment to relax, William is being pumped through the aorta to deliver his oxygen all around the body. -
While flying through the arteries, William come across a set of capillaries in his human’s legs. The oxygen didn’t want to jump from Williams plane as he was afraid of heights, this created a blood clot, William kicks the oxygen to save the day! The oxygen delivers through the small tubes of the capillaries.
William then counties to drop his oxygen to tired muscle cells and collect the carbon dioxide. This is called gas exchange.
After William delivers his oxygen around the body, he zooms through a blood vein to arrive at the vena cava. William enters the heart through the vena cava, where he is then prepared to start his cycle as a red blood cell again.