Question

The CO${}_2$ in the blood is mostly carried

• A. By haemoglobin in RBC
• B. In the cytoplasm of WBC
• C. In the plasma as bicarbonate ions
• D. By plasma proteins

Answer 1

The correct option is C In the plasma as bicarbonate ions

Carbon dioxide is carried in the body in the following forms:

•7% of carbon dioxide is transported in the dissolved state in plasma.

•23% of carbon dioxide is transported as carbaminohaemoglobin in blood.

•70% of carbon dioxide is transported as bicarbonates in plasma.

Hence, maximum carbon dioxide is carried in blood in plasma as bicarbonate ions.

So, the correct answer is 'In the plasma as bicarbonate ions'.