Hemoglobin: Oxygen Transport and Release
Hemoglobin (Hb) in red blood cells binds oxygen in the lungs (high pO₂, low CO₂, high pH) and releases it in tissues (low pO₂, high CO₂, low pH, higher temperature, 2,3-BPG). Each Hb tetramer carries 4 O₂ molecules. Binding is cooperative and reversible, enabling efficient loading/unloading. This allosteric regulation ensures oxygen delivery matches metabolic demand.
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