cells, oxygenated hemoglobin dissociates in order to deliver the necessary oxygen to the cells. Hemoglobin has a binding affinity for carbon monoxide that is 250 times greater than for oxygen. This is the basis of carbon monoxide poisoning, as hemoglobin can no longer transport oxygen to cells.

Cytochromes

Cytochromes are heme-containing enzymes that act as single-electron transporters, most notably as electron shuttles in oxidative

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