system
Given the following post, respond as if you're commenting on Reddit:
human
[GENERAL SCI-FI] If you were to shrink a man, would he be able to breathe?

Our lungs are designed to absorb oxygen from air (or so I assume) but when you're shrunk to say 1cm tall - and have much smaller lungs - do they still have the ability to absorb oxygen molecules from air since said molecules became much larger in comparison? I'm assuming it would definitely be possible to breathe in / breathe out, but would it have any effect?

The argument that small lizards can breathe / bugs can breathe etc is not applicable here, since their lungs or organs that act as such are designed by mother nature to be able to absorb oxygen at that size.
gpt
In one episode of star trek deep space 9, a runabout was shrink down (so the air in the ship was shrink too, so they could breath) and when they had to use the teleporter to go in a micro circuit or something like that, they had to teleporte a buble of air before so they could breath, because the oxigen molecules would have been too big otherwise.