My wife is currently an RN, but is taking additional classes to get to NP. Since she's studying online (along with everyone else), and because I've known her professor for decades (great guy), I sometimes listen in on her lectures while doing chores in the same room. Recently, they went into great detail about the respiratory process and blood oxygen uptake mechanisms. What you're saying is definitely intriguing. If you have any links I could look at, I'd appreciate a BM.