So we know what happens to our oxygen when the alveoli basically released that oxygen into the capillaries. But what happens to our oxygen as the hemoglobin and the red blood cells carry that oxygen along our blood vessel system, to our tissues and organs of the body? So as hemoglobin carries oxygen in the red blood cells and within our blood plasma of the blood vessels, it protects the non polar water molecule from the polar cytoplasm of the red blood cell and the polar plasma of our blood. And what that means is our hemoglobin keeps the oxygen protected and it keeps the oxygen comfortable within that hydrophobic section of the inside of our hemoglobin. So, remember, the outside of the protein is polar, but the inside of the protein where we have the oxygen is a hydrophobic portion. So it's non polar.