– If humans breathe in oxygen and exhale CO2, then why does mouth-to-mouth resuscitation work?

Question

– If humans breathe in oxygen and exhale CO2, then why does mouth-to-mouth resuscitation work?

In: 172

Answer 1

We don’t JUST breathe in oxygen and breathe out CO2. It’s a mix of gases. The air we are used to breathing in only contains 21% oxygen. We breathe out about 16% oxygen. That’s still enough to keep someone oxygenated for awhile.