The Great Gas Swap · Lungs
Oxygen makes hemoglobin brighter red — never blue.
Blood leaving your lungs is bright scarlet. Blood returning from your body is a deep brick red. Same blood, same cells — the only difference is whether hemoglobin is carrying oxygen.
There's more: oxygen makes hemoglobin brighter red — never blue. 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