Er, yes. Thanks for that. I think most of us are aware of the circulatory system and how it works.
As a (once) severe asthmatic I have had many blood gas tests (arterial draws) that have come back nearly white. You can tell if your bloods have little oxygen as you tend to have severe difficulty breathing (or full respiratory arrest) and are blue around the mouth.
Cheers though for reminding us of the importance of iron and oxygen!
