1 liter can contain upto 490ml oxygen but supplemental oxygen is upto 60 liters per minute. Do they plan to put a bubbler to replenish oxygen? And did they comp

1 liter can contain upto 490ml oxygen but supplemental oxygen is upto 60 liters per minute. Do they plan to put a bubbler to replenish oxygen? And did they compute maximum oxygen transfer for the intestines? They administered a "dose of non-oxygenated perfluorodecalin" but there is "oxygenation effect" observed. How?