system
Given the following post, respond as if you're commenting on Reddit:
human
Instead of breathing would it be possible to just oxygenate our blood?

Like instead of breathing through the lungs, just directly oxygenate the blood and have it enter the blood stream.
gpt
This is what is done during some heart surgeries, using a heart-lung machine to mechanically oxygenate the blood. It takes venous blood out of the patient and passes it along membranes to oxygenate it, then reconnects to the patient's arteries.

However, there are complications associated with using a machine to do imperfectly what our lungs are very good at. Studies have shown that many patients who have been on a heart-lung machine suffer minor brain damage afterwards.