What is the correct answer? I will thumbs up the right answer Joe\'s Arterial bl

Question

What is the correct answer? I will thumbs up the right answer

Joe's Arterial blood tests revealed the following: pO2 (partial pressure of oxygen in the plasma) 73 mm Hg (normal- 80-105 mm Hg) pCO2 (partial pressure of carbon dioxide in the plasma) 50 mm Hg (normal 35- 45 mm Hg) pH-7.32 (normal 7.35-7.45) Hb-O2 sat (hemoglobin-oxygen saturation)-84% (normal-95-9896) Why was Joe's pCO2 increased above normal? Joe's pCO2 level is above normal because his CO2 cannot be converted to HCO3- Joe's pCO2 level is above normal because his obstructive lung disease makes it difficult for him to excrete CO2 at a sufficient rate. Joe's pCO2 level is above normal because his CO2 will not bind with hemoglobin

Explanation / Answer

Joe's pCO2 is above normal because his CO2 cannot be converted into HCO3-.

This is because CO2 present in tissues diffuses to blood plasma there it reacts with water in red blood cells to form HCO3- as the concentration of HCO3- increase in RBCs it creates a potential gradient between plasma and RBCs and it diffuses to plasma.Most of CO2 in plasma is transported as HCO3- .but when there is more concentration of CO2 in plasma the concentration gradient is disturbed and amount of CO2 starts increasing in body. A small amount of CO2 form carbamino- heam by reacting with heam but in low oxygen concentration more CO2 binds to heam thus there is an increase in CO2 concentration.

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