– 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

Because we don’t breath in oxygen and exhale co2. We breath in air which is about 78% nitrogen, 21% oxygen and 0.05% co2. Then we exhale air with a bit less oxygen, about 16%, and a bit more co2.