How is the Haldane effect diff from the Bohr effect?

The simplest way to differentiate the two effects is to identify which molecule is the cause of the change.

The Haldane effect describes how oxygen concentrations determine hemoglobin's affinity for carbon dioxide. For example, high oxygen concentrations enhance the unloading of carbon dioxide. The converse is also true: low oxygen concentations promote loading of carbon dioxide onto hemoglobin. In both situations, it is oxygen that causes the change in carbon dioxide levels.

The Bohr effect, on the other hand, describes how carbon dioxide and H+ affect the affinity of hemoglobin for oxygen. High CO2 and H+ concentrations cause decreases in affinity for oxygen, while low concentrations cause high affinity for oxygen.

To further illustrate the difference, it might help to look at specific examples. In the lungs, when hemoglobin loaded with carbon dioxide is exposed to high oxygen levels, hemoglobin's affinity for carbon dioxide decreases. This is an example of the Haldane effect.

In active muscles, carbon dioxide and H+ levels are high. Oxygenated blood that flows past is affected by these conditions, and the affinity of hemoglobin for oxygen is decreased, allowing oxygen to be transferred to the tissues. Because we are looking at the situation from the perpsective of carbon dioxide changing oxygen affinity, this is an example of the Bohr effect.

I hope this has helped to clear up the confusion.

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How is the Haldane effect diff from the Bohr effect?