Q. 3. How is oxygen and carbon dioxide transported in human beings?
Oxygen and carbon dioxide transported in human beings
(i) The transportation of Oxygen from the lungs to other body parts takes place through our blood vessels. Oxygen has low water solubillity and therefore cannot be transported directly in plasma. The red blood cells contain a pigment called Haemoglobin with which the Oxygen molecules stick once they are absorbed through our lungs. These red blood cells carry the oxygen to the oxygen-deficient parts and then release it to be used for respiration.
(ii) Carbon dioxide is the by product of respiration abd has to be eliminated from our bodies. Due to its high solubility in water it is directly transported from various body parts to the lungs through the plasma of our blood only and is released in the environment by exhaling.