Blood grabs oxygen in the lungs and lets it go in tissues thanks to hemoglobin's clever S-shaped curve. See how shifts load and unload more O₂.
Oxygen–Hemoglobin DissociationLive
how blood loads and unloads O₂
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Hemoglobin's S-shaped curve lets blood grab oxygen in the lungs and release it in tissues. The cooperative binding (Hill coefficient > 1) makes the curve steep, so a small pressure drop unloads a lot of O₂. A right shift (higher P50) releases even more where it's needed. Educational tool, not medical advice.
Reading this result: Cooperative binding (Hill 2.7) gives the S-shape: the swing from 40 to 100 mmHg moves saturation from 75% to 97%, which is how tissues get their O₂.
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How it works
The oxygen–hemoglobin dissociation curve is sigmoidal because binding is cooperative (Hill coefficient > 1). The steep middle means a small pressure drop in tissue releases lots of oxygen. A right shift (higher P50) from heat, CO₂, or acidity unloads even more where metabolism is high. Educational tool, not medical advice.
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