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    • When breathing in, air starts by moving into the body through the mouth and nose.
    • Air moves down the trachea after entering the body.
    • Air moves from the trachea into the bronchi and through the bronchioles.
    • Air moves from the bronchioles to the alveoli.
    • Oxygen diffuses from the alveoli into the blood in the network of capillaries surrounding the alveoli.
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