Dudes and dudettes, let me tell you how high yield Pathoma Ch. 1-3 are. Dr. Sattar is the freaking man.
Anyway, this is reversible cell injury because of swelling. If the Na/K ATPase is not working, Na is not leaving. Na follows water, so water is getting stuck in the cell, leading to swelling.
Most important is recognizing that it's reversible cell injury - everything else (except PFK lol) is talking about cell death