Question

Choose the correct answer from the alternatives given.
In which of the following forms $C{O}_2$ is mostly carried in blood?

• A. Hydrogencarbonate ions
• B. Carbonic acid
• C. Carbonate ions
• D. Carbaminohaemoglobin

Answer 1

The correct option is A Hydrogencarbonate ions

Carbon dioxide molecules are transported in the blood from body tissues to the lungs by one of three methods: by dissolving directly in the blood, by binding to hemoglobin, or is carried as a bicarbonate ion. The majority of carbon dioxide is transported as part of the bicarbonate buffer system. Therefore, Major amount of CO${}_2$ from the tissues is transported to the lungs in the form of hydrogen carbonates (bicarbonates). So, the correct option is 'Hydrogen carbonate ions'.