Big Confuse in Gaseous Exchange !!!!

[chuinhen]

CO2 is mainly transported in the form of H+ HCO3- in the erythrocyte .

 

Thanks to the help of Carbonic anhydrase .

 

However , I'm confused with the role of these enzyme .

 

this enzyme catalyses which reaction ??

 

1) CO2 + H2O -----> H2CO3

 

OR

 

2)H2CO3 ------> H+ + CO3-

 

 

 

For our Information :

 

The Book written by Campbell , Reece and Mitchell published by Benjamin Cummings stated no.2

 

The book written by Greece and Stout published by Cambridge staed no.1

[chadn]

Carbonic anhydrase catalyses the reaction of CO2 with H2O to form H2CO3.

 

The second reaction doesnt require catalysis to my knowledge.

[Nashyboyo]

Carbonic anhydrase catalyses the reaction of CO2 with H2O to form H2CO3.

 

The second reaction doesnt require catalysis to my knowledge.

 

the reaction is in equilibrium so the same enzyme catalyses both the forward and backward reactions. i'm pretty sure that the enzyme catalyses both reactions 1 and 2.

[Bluenoise]

First of all your missing a Hydrogen in the second reaction.

 

H2CO3 <-----> HCO3- + H+ is what it should be

 

Second this is NOT enzyme catalysed. It's just an acid being deprotonated.

 

 

SO yeah it catalyses only the first reaction.