Question

In which forms carbon dioxide is transported to the lungs by blood?

Answer 1

Transport of Gases

The gases exchanged between the alveoli and blood and between the tissue and blood are transported through the body by the blood. Gases that are mainly transported are Oxygen and Carbon dioxide.

Transport of Carbon Dioxide (CO2)

It occurs in three ways:

• Carbonic acid: The CO2 combines with water present in the plasma and forms carbonic acid. About 7% of CO2 is carried this way.
• Carbamino-hemoglobin: About 20-25% of CO2 binds with the hemoglobin and gets transported.
• Bicarbonates: About 70% of CO2 gets transported as bicarbonate ions and diffuses through the plasma.

Therefore, carbon dioxide is transported to the lungs by the blood in the form of Carbonic acid, Carbamino-hemoglobin, and Bicarbonates.