Cells need oxygen to function and clearly the cells in a zombie are at least partly functional. In the Walking Dead, do zombies need oxygen? Can they breathe? If they don't have functional respiratory or circulatory systems, do they absorb some oxygen through exposed tissue?
Related: In Walking Dead (TV), how do zombies walk without blood circulating?
Answer
TL;DR: No, zombies don't need oxygen to survive. We don't know how zombie physiology works, but we know that they don't breathe.
In fact, we've seen a number of walkers surviving long periods of time underwater.
And at least one buried (but still active) walker.
It has also been established that a severed zombie head remains active unless the brain is destroyed. This is relevant, because obviously, severed heads don't have lungs attached to them.
The zombies in The Walking Dead don't need to do anything, really. They don't need to breathe, as these gifs show, and they also don't need to eat, despite the fact that they do so all the time. Their respiratory and digestive systems are rotten and useless. They can't breathe, and they can't digest anything. Since they can't do these things, obviously they also don't need to do them.
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