system
Given the following post, respond as if you're commenting on Reddit:
human
If only 4-5% of the air we exhale is CO2, how many times can we breathe the same one breath? And at what point would we pass out.
gpt
Interestingly, your body registers suffocation not by the lack of O2 in the air but by the concentration of CO2 in your blood. Without a way to get rid of CO2, you would still feel the same as if you were holding your breath.