How is oxygen transported by the circulatory system after it diffuses across the fused respiratory membrane of the alveoli and blood capillaries?

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1. Oxygen diffuses from the alveoli into surrounding capillaries

2. Oxygen enters a RBC

3. It then binds to a molecule of hemoglobin, creating oxyhemoglobin, and is carried through blood vessels to a capillary

4. Oxygen then diffuses from the blood to the body's tissues