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    The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and m
    Question

    The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic:

    A.

    D – Lower end of lungs – diaphragm pulls it down during inspiration

    B.

    A – trachea - long tube supported by complete cartilaginous rings for conducting inspired air

    C.

    B – pleural membrane - surround ribs on both sides to provide cushion against rubbing

    D.

    C – Alveoli - thin walled vascular bag like structures for exchange of gases

    Correct option is D

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