CO2 is primarily transpoed in the aerial blood as
Correct Answer: Bicarbonate
Description: D i.e. Bicarbonate Transpo of CO2 in the form of bicarbonate ions accounts for approximately 70% of transpoed carbon dioxide from the tissues to lungs Q. So CO2 is transpoed as plasma HCO3 - > RBC > HCO3- > Carbamino compound > dissolved CO2 Q &Transpo of Carbon Dioxide Carbon dioxide is transpoed in the blood as: HCO3- (70%) > carbamino compounds (23%) > dissolved CO2 (7%) Chloride Shift/ Hamburger Phenomenon When the negatively charged (HCO3-) bicarbonate ions move out of red blood cell into the plasma, to maintain the electrolytic equilibrium the negatively charged chloride ions move into the Red blood Cells from plasma (In plasma plenty of sodium chloride is present). This process is mediated by band 3 membrane protein Chloride shift occurs in: 1 secondQ Hematocrit of venous blood is: greater (by 3%)than that of aerial bloodQ PH of venous blood (7.36) is lower than that of aerial blood (7.40)Q * For each CO2 molecule added to RBC there is increase in one osmotically active paicle in cell either HCO3- or CI-. So RBC take up water & swell. For this reason plus a fact that some aerial fluid returns lymphatics rather than the veins, the hematocrit of venous blood is 3% greater than aerial bloodQ. Amount of 02 enters the body/min = 250 inVininQ Amount of CO2 excreted by lung/ min = 200 inVininQ (288 L/day)Q * CO2 is 20 times more soluble than 02
Category:
Physiology
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