Could a semi-permeable membrane, which releases CO2 but contains O2 and nitrogen, biologically exist?

I'm trying to create an alien which has external lungs. Air can be inhaled normally however, is it plausible that the material the lungs are made of is semi-permeable. Containing the nitrogen and oxygen while allowing the carbon dioxide to diffuse outward?

Since nitrogen and oxygen are smaller than CO2, would it be possible for them to diffuse through a membrane into second chamber while the CO2 remains in the original?

is a duplicate

This question has been asked before and has already been answered. It should be marked as a duplicate.

Please enter the URL of the proposed duplicate in the details field below.

not constructive

This question cannot be answered in a way that is helpful to anyone. It's not possible to learn something from possible answers, except for the solution for the specific problem of the asker.

Communities

Could a semi-permeable membrane, which releases CO2 but contains O2 and nitrogen, biologically exist?

0 comment threads

0 answers