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    Question

    In the human respiratory system, gas exchange between

    air and blood primarily occurs in which structure?
    A Alveoli Correct Answer Incorrect Answer
    B Trachea Correct Answer Incorrect Answer
    C Bronchi Correct Answer Incorrect Answer
    D Larynx Correct Answer Incorrect Answer

    Solution

    Alveoli are tiny air sacs at the ends of the bronchioles in the lungs and are the primary sites of gas exchange. Their walls are extremely thin and surrounded by a dense network of capillaries.

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