Your red blood cells are like delivery trucks carrying oxygen to your tissues. But here's the catch: without adequate CO2, those trucks never unload their cargo.
The Bohr Effect, discovered in 1904, shows that CO2 is the key that unlocks oxygen from hemoglobin. Low CO2 = oxygen stays stuck in your blood instead of entering your cells.
This is why you can have "normal" blood oxygen levels but still feel like you're suffocating.
