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Short Answer Type Questions

 

Q 1 State the different modes of CO2 transport in blood.

 
 
 Carbondioxide is carried by the bloodin three forms
(i) In Dissolved State Under normal temperature and pressure, about 7% carbondioxide is carried by physical solution.
(i) As Carbamino Compounds carbondioxide binds directly with Hb to form an unstable
compound carbaminocompounds (carbondioxide Hb) About 23%carbondioxide is transported in this form. When pCO2 high and pO2 is ow as in the tissues. more binding of carbon-dioxide occurs whereas, when pCO2  is low and 90, is high as in alveol as tissue dissociation of carbondioxide, from carbamino-haemoglobin takes place.

            HbO2  +  CO2  -   HbCO2  +  H  +O2


(il) As Bicarbonate lons carbondioxide reacts wilh walter to form carbonic acid (H2CO3) in the presence of carbonic anhyclase in RBC. H2CO3 dissociates into hydrogen and bicarbonate ions (HCO3)
The whole reaction proceeds as follows

                       carbonic                                                

CO2   +  H2O  -  H2CO3  (carbonic acid)

H2CO3   -   H+  (hydrogen ion)   +  HCO3  (Bicarbonate)

The carbonic anhydrase reaction mainly occur in RBC as it contain high concentration of enzyme carbonic anhydrase and minute quantity of it is present in plasma too.

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