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Q.

Given below are two statements.

Statement I: In the blood capillaries at tissues, H2CO3 dissociates into H+ and HCO3-.

Statement II: In the blood capillaries at the lungs, H2CO3 dissociates into CO2 and H2O.

In light of the above statements, choose the correct answer from the options given below. 

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a

Both statement I and statement II are correct.

b

Both statement I and statement II are incorrect.

c

Statement I is correct but statement II is incorrect.

d

Statement I is incorrect but statement II is correct. 

answer is A.

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Detailed Solution

The following reaction occurs at the tissue site where the partial pressure of CO2 is high.

CO2 + H2O H2CO3 HCO3-+H+

At alveoli where there is low pCO2, the following reaction occurs.

 HCO3-+H+H2CO3 CO2 + H2O

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