The Great Gas Swap · Lungs
Blood arrives partly loaded and leaves nearly full.
Blood arriving at your lungs isn't empty of oxygen — it's about three-quarters full. It leaves almost completely full. That leftover reserve is why you don't black out the moment you hold your breath.
There's more: blood arrives partly loaded and leaves nearly full. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
Body Atlas is an educational product. It does not provide diagnosis, treatment, or personal medical advice. · Privacy