The oxygen gas diffusion through the wall air bag into the capillary from the breath to gather with the hemoglobin in red blood cells. Make the blood red, and then flows along the blood vessels to the heart. The heart will pump the blood into arteries, according to the different parts of the body, the oxygen gas to perform metabolic reactions of nutrients inside the cell, leave out the energy so that the body can be used in various activities which the nutrients metabolism reactions, gas, car Bon dioxide to cells. Therefore, While the oxygen gas diffusion through the cell, red blood cell into the cells in different parts of the body, gas, car Bon dioxide from these cells spread into the red blood cells to enter into the veins back to the heart and into the lungs to continue gas exchange.
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