How is oxygen and carbon dioxide transported in human beings?
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The two main gases exchanged are oxygen and carbon-dioxide. Oxygen is absorbed by the blood capillaries from the lungs alveoli by diffusion while carbon-dioxide is absorbed by the lungs alveoli from blood capillaries by diffusion. ... Oxygen is transported from lungs to the body cells in the form of oxy-hemoglobin......
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When we inhale air,oxygen reaches the alveoli in lungs, which is surrounded by thin capillaries. These capillaries carry blood in them. The oxygen diffuse from the alveoli walls to the blood in capillaries. This blood travels through the body. Haemoglobin binds with oxygen and carries it along with blood. Carbon dioxide is produced as a waste product in respiration in the cells of tissue. This carbon dioxide is transported in dissolved form in the blood, which carries it back to the lungs,where it diffuses into alveoli and then to trachea and finally from nostrils to out of the body into air.
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