chuinhen Posted August 2, 2006 Share Posted August 2, 2006 how is CO2 transported in our blood stream ?? Does it dissolve in water in blood plasma physically to form dissolve CO2 ?? or dissolve in water in blood plasma chemically to form carbonic acid !! Link to comment Share on other sites More sharing options...
Primarygun Posted August 2, 2006 Share Posted August 2, 2006 Both. However, for oxygen, it is mainly in the form of oxyhaemoglobin. A considerable part of dissolved carbon dioxide is converted into carbon acid. I would say it is the hydrogencarbonate ion that is responsible for the transport. Link to comment Share on other sites More sharing options...
Mokele Posted August 3, 2006 Share Posted August 3, 2006 Mostly in the form of bicarbonate ions. In such form, it serves as a buffer, keeping the body's pH where it should be. Deviations from the body's pH can, in some cases, be fixed by simply exhaling more CO2, lowering the bicarbonate ion concentration. Mokele Link to comment Share on other sites More sharing options...
Skye Posted August 5, 2006 Share Posted August 5, 2006 Carbon dioxide and carbonic acid exist in an equlibrium in your body, with the equilibrium favouring carbonic acid. The enzyme carbonic anhydrase catalyses the reversible reaction of carbon dioxide to carbonic acid, and vice versa. In tissues where there's carbon dioxide being produced, in order to maintain the equilibrium carbon dioxide is converted to carbonic acid, catalysed by carbonic anhydrase. In the lungs the carbon dioxide is released, so the carbonic acid is converted to carbon diozide to maintain the equilibrium. Link to comment Share on other sites More sharing options...
chuinhen Posted August 6, 2006 Author Share Posted August 6, 2006 the catalysis takes place in the erythrocyte only !?! how about in the plasma where carbonic anhydrase is absent!!! Link to comment Share on other sites More sharing options...
dttom Posted August 30, 2006 Share Posted August 30, 2006 i think the carbon dioxide is first entered the erythrocytes and be changed to hydrogencarbonate then is released back to plasma. Link to comment Share on other sites More sharing options...
chuinhen Posted September 3, 2006 Author Share Posted September 3, 2006 thats the point !!! so that means that carbon dioxide dissolve physically in blood plasma but Co2 form HCO3- in erythrocyte only ??!?!?!?! pleasee... i need arguments !!!! Link to comment Share on other sites More sharing options...
Nashyboyo Posted September 7, 2006 Share Posted September 7, 2006 its present in both. if the plasma was the only medium for transport then we would die (insufficient). fact haemoglobin is actually effected by CO2 conc so that the bohr shift can exist look up the bohr shift Link to comment Share on other sites More sharing options...
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