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Oxygen is inhaled into the body through the nose or the mouth. It travels through the trachea, to the bronchi, then through the bronchial tubes, and finally settles in the alveoli, which are tiny sacs in the lungs. As the blood is pumped into the lungs through the pulmonary artery of the right ventricle of the heart, the oxygen-depleted blood goes to the capillaries which wraps the alveoli. In the capillaries, oxygen is given from the alveoli to the blood, and blood would drop of carbone dioxide into the alveoli. Once this process is complete, the blood would return to the heart, and the carbone dioxide would be expelled from the body as we exhale.

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16y ago

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