Punjab Medical Punjab - MET Solved Paper-2010

  • question_answer
    The exchange of gases in the alveoli of the lungs takes place by

    A)  osmosis

    B)  simple diffusion

    C)  passive transport

    D)  active transport

    Correct Answer: B

    Solution :

    Oxygen diffuses from alveoli to deoxygenated blood, and carbon dioxide diffuses from deoxygenated blood to alveoli by simple diffusion. Diffusion is defined as, the flow of the substance (gases) from a region of their higher concentration to a region of lower concentration.


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