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The Bohr effect hinges around the electromagnetic allosteric interactions between the heme molecules of the hemoglobin tetramer.  The Bohr effect a decrease in the amount of oxygen associated with hemoglobin and other respiratory compounds in the inner mitochondrial membrane in the cristae in response to a lowered blood pH resulting from an increased concentration of carbon dioxide in the blood.  Recall that in humans, CO2 levels, and not oxygenation stimulate breathing rhythms in the brain.

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