Identify the correct statement with reference to transport of respiratory gases by blood.

Easy

A

Haemoglobin is necessary for transport of carbon dioxide and carbonic anhydrase for transport of oxygen
B

Haemoglobin is necessary for transport of oxygen and carbonic anhydrase is required for transport of carbon dioxide
C

Only oxygen is transported by blood
D

Only carbon dioxide is transported by blood.

Solution

About 97 per cent of O₂ is transported by RBCs in the blood. Haemoglobin is a red coloured iron containing pigment present in the RBCs. O₂ can bind with haemoglobin in a reversible manner to form oxyhaemoglobin.
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 transport of carbon dioxide as carbonic anhydrase.

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