Factors Affecting Hemoglobin Dissociation Curve

This educational video explains the five main factors that influence the affinity of hemoglobin for oxygen and how they affect the oxygen-hemoglobin dissociation curve. The factors discussed are pH, temperature, carbon dioxide, 2,3-bisphosphoglycerate (2,3-BPG), and carbon monoxide. The video begins by describing the Bohr effect, where increased hydrogen ion concentration (lower pH) decreases hemoglobin’s oxygen affinity, causing a rightward shift in the dissociation curve, facilitating oxygen release to tissues. Next, it explains that increased temperature similarly reduces oxygen affinity and shifts the curve rightward. The Haldane effect is then covered, where carbon dioxide directly binds to hemoglobin, also decreasing oxygen affinity and causing a rightward shift. The role of 2,3-BPG, a byproduct of glycolysis, is discussed; it binds to hemoglobin and reduces oxygen affinity, again shifting the curve rightward. Finally, carbon monoxide is presented as a competitive inhibitor that binds to hemoglobin with much higher affinity than oxygen, increasing oxygen affinity and causing a leftward shift while also reducing oxygen-carrying capacity. The video uses clear diagrams and examples to illustrate these concepts, making it a useful tutorial for students of physiology.