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DisgustedByMisleadia 6 points ago +7 / -1

I think his comment was referring the pulmonary alveoli, where gas exchange occurs between the air and blood:

https://en.wikipedia.org/wiki/Pulmonary_alveolus

But, I don't think it's accurate to call it "coagulation":

https://en.wikipedia.org/wiki/Ground-glass_opacity