What is the Bohr effect?

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What is the Bohr effect?

The Bohr effect describes how tissue metabolism products—carbon dioxide and hydrogen ions—alter hemoglobin’s oxygen-binding affinity. When CO2 rises and pH falls, hemoglobin shifts toward the low-affinity, T state, making it release oxygen more readily to active tissues. In the lungs, CO2 is expelled and pH rises, nudging hemoglobin back toward the high-affinity, R state to pick up O2. So, the best description is that hemoglobin’s oxygen affinity decreases with increased CO2 and decreased pH, promoting O2 release in tissues. Statements claiming increased affinity with CO2, or that CO2 has no effect, or that higher pH always increases affinity regardless of CO2, don’t match this physiologic mechanism.

The Bohr effect describes how tissue metabolism products—carbon dioxide and hydrogen ions—alter hemoglobin’s oxygen-binding affinity. When CO2 rises and pH falls, hemoglobin shifts toward the low-affinity, T state, making it release oxygen more readily to active tissues. In the lungs, CO2 is expelled and pH rises, nudging hemoglobin back toward the high-affinity, R state to pick up O2. So, the best description is that hemoglobin’s oxygen affinity decreases with increased CO2 and decreased pH, promoting O2 release in tissues. Statements claiming increased affinity with CO2, or that CO2 has no effect, or that higher pH always increases affinity regardless of CO2, don’t match this physiologic mechanism.

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