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Q.

Which of the following statements are not true for pulmonary gaseous exchange?
(A) Dissociation of CO2  from carbaminohaemoglobin
(B) Percentage saturation of haemoglobin increases due to high pO2  
(C) Carbonic anhydrase catalyses the formation of HCO3 and H+ from  H2CO3
(D) Oxygen dissociation curve shifts towards right side
(E) 100 ml of blood delivers 4 ml of  CO2 to the alveoli. 
Choose the correct answer from the following options.

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a

A, B and C 

b

B, C and E 

c

C and D only 

d

A, B and D 

answer is D.

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Detailed Solution

At tissues H2CO3  dissociates into HCO3  and H+O2 dissociation curve shifts to right at tissues but not at alveoli.

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