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During inhalation or exhalation air is pulled towards or away from the lungs, by several cavities, tubes, and openings. The organs of the respiratory system make sure that oxygen enters our bodies and carbon dioxide leaves our bodies. The respiratory tract is the path of air from the nose to the lungs.
Your alveoli are surrounded by minute blood vessels, as this is where gases diffuse from your lungs into your blood and from your blood into your lungs. Oxygen passes from your alveoli into your blood and carbon dioxide, which is produced when your cells break down nutrients, passes from your blood into your alveoli.