How Does Oxygen Enter Our Bodies?

Answer

The respiratory system is how oxygen enters our bodies. The function of the respiratory system is to supply oxygen to the blood so the blood can deliver oxygen to the parts of the body. We breathe in oxygen and breathe out carbon dioxide. Oxygen enters the body through the nose and mouth as we breathe in. The oxygen then goes through the larynx, the trachea, the bronchial tubes, and into the lungs. It passes into the alveoli and diffuses through capillaries into the arterial blood.
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