0x668143c4…385fsent to0x54ca7ff4…7b3e·#11,856,644·view on Etherscan
Lungs have evolved to make sure blood pressure stays up, with angiotensin II. Fits with my idea that gas exchange is osmotic, and, osmosis is H+ moving, H3O2- breaking down, e- moving, and H2O forming with external O2.
Hypoxic pulmonary vasoconstriction (HPV) reflex might also fit with osmotic gas exchange.