2, 3 DPG causes ?
**Core Concept**
2,3-Bisphosphoglycerate (2,3-DPG) is a molecule that plays a crucial role in the regulation of oxygen binding to hemoglobin. It is produced in red blood cells through the Rapoport-Luebering pathway. This pathway is significant for adapting to high-altitude conditions or chronic hypoxia.
**Why the Correct Answer is Right**
The correct answer is related to the effect of 2,3-DPG on hemoglobin's oxygen-binding affinity. 2,3-DPG binds to deoxyhemoglobin, reducing hemoglobin's affinity for oxygen. This facilitates the release of oxygen to tissues, especially under conditions of low oxygen tension. The binding of 2,3-DPG to hemoglobin stabilizes the deoxy form of hemoglobin, thereby decreasing the oxygen affinity of hemoglobin.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because 2,3-DPG does not directly increase oxygen binding to hemoglobin.
**Option B:** This option is incorrect as 2,3-DPG's primary role is not in the transport of carbon dioxide.
**Option C:** This option is incorrect because 2,3-DPG does not directly participate in the buffering of hydrogen ions in the blood.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that 2,3-DPG levels are elevated in response to chronic hypoxia, helping to improve oxygen delivery to tissues. This is a critical adaptation mechanism.
**Correct Answer:** D. Right shift of oxygen hemoglobin dissociation curve.