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NEET AIPMT SOLVED PAPER 1998

  • 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 \[C{{O}_{2}}\] 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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