Now, recall that oxygen exists in its diatomic form. So in one oxygen molecule, we have two individual oxygen atoms that are double bonded by nonpolar bond. And that means oxygen is nonpolar. Now, because water is the main constituent of blood plasma that makes our blood aqueous. And that implies that oxygen, because it is non polar, it does not actually easily dissolve in the aqueous blood plasma. And so what happens, or what needs to happen is when oxygen gets into our lungs, it's the red blood cells that actually pick up that oxygen in the lungs and carry it to the cells of our body that need that oxygen to basically produce ATP for energy.