What pathway modulates the release of O2 based on tissue demand?

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Multiple Choice

What pathway modulates the release of O2 based on tissue demand?

Oxygen delivery to tissues is tuned by the level of 2,3-bisphosphoglycerate (2,3-BPG) in red blood cells. The Luebering-Rapaport pathway diverts glycolytic intermediates to produce 2,3-BPG. When tissue oxygen demand rises, 2,3-BPG increases and binds to deoxyhemoglobin, lowering hemoglobin’s affinity for oxygen. This shifts oxygen release toward tissues that need it, enhancing delivery without changing arterial PO2. The 2,3-BPG is later converted back to normal glycolytic intermediates to continue energy production. The other pathways aren’t responsible for this modulatory effect: Embden-Meyerhof is the main glycolytic route producing ATP, the hexose-monophosphate shunt generates NADPH and ribose-5-phosphate, and the methemoglobin reductase pathway recycles methemoglobin.

Oxygen delivery to tissues is tuned by the level of 2,3-bisphosphoglycerate (2,3-BPG) in red blood cells. The Luebering-Rapaport pathway diverts glycolytic intermediates to produce 2,3-BPG. When tissue oxygen demand rises, 2,3-BPG increases and binds to deoxyhemoglobin, lowering hemoglobin’s affinity for oxygen. This shifts oxygen release toward tissues that need it, enhancing delivery without changing arterial PO2. The 2,3-BPG is later converted back to normal glycolytic intermediates to continue energy production.

The other pathways aren’t responsible for this modulatory effect: Embden-Meyerhof is the main glycolytic route producing ATP, the hexose-monophosphate shunt generates NADPH and ribose-5-phosphate, and the methemoglobin reductase pathway recycles methemoglobin.

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