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How is Oxygen and Carbon Dioxide Transported in Human Beings

Answer: 

Transport of oxygen in human beings: The oxygen is transported in human beings by hemoglobin present in the red blood cells from the air to the lungs. The oxygen molecules can combine with the hemoglobin molecules easily. The molecules release the oxygen to the tissues that are deficient in oxygen. 

Transport of carbon dioxide in human beings: It is mostly transported from body tissues in the dissolved form in our blood plasma to the lungs where it diffuses from blood to air in the lungs and then is expelled out through nostrils.