Q. 43.8( 15 Votes )

What are the major t

Answer :

The transport mechanism of CO2 takes place mainly by the haemoglobin. The carbon dioxide dissolved in the blood combines with the haemoglobin to form carbamino-haemoglobin (about 20-25 per cent), which is carried to the alveoli from the tissue. This binding is related to the partial pressure of CO2. Partial pressure of O2 is a major factor, which could affect this binding. When pCO2 is high and pO2 is low as in the tissues, more binding of carbon dioxide occurs whereas, when the pCO2 is low and pO2 is high as in the alveoli, dissociation of CO2 from carbamino-haemoglobin takes place. During the dissociation of carbamino-haemoglobin the CO2 bound to haemoglobin from the tissues is delivered at the alveoli. RBCs contain a very high concentration of the enzyme, carbonic anhydrase and minute quantities of the same is present in the plasma too. This enzyme facilitates the following reaction in both directions. CO2 + H2O → H2CO3 HCO-3 + H+ In the above reaction CO2 combines with H2O in the presence of carbonic anhydrase to form H2CO3 this is futher split into to HCO3 - +H+ . At the alveolar site where pCO2 is low, the reaction proceeds in the opposite direction leading to the formation of CO2 and H2O. Thus, CO2 trapped as bicarbonate at the tissue level and transported to the alveoli is released out as CO2. By these methods every 100 ml of blood transports about 4ml of carbon dioxide to the alveoli to be exhaled.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

The arrangement oBiology - Exemplar

Some varieties ofBiology - Exemplar

Comment upon the Biology - Exemplar

Sunflower is not Biology - Exemplar

Trace the events Biology - Exemplar

Name the two impoBiology - Exemplar

Oxygen is criticaBiology - Exemplar

Lichen is usuallyBiology - Exemplar

What special anatBiology - Exemplar

A sample of urineBiology - Exemplar