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7th Class Science Respiration in Organisms Question Bank Respiration in organisms

  • question_answer
    What will happen when diaphragm relaxes and curves upwards?

    A)  Air is forced out of the lungs.

    B)  The rib cage goes up and outward.

    C)  The volume of the thoracic cavity increases.

    D)  Air pressure inside the thoracic cavity decreases.

    Correct Answer: A

    Solution :

    When structure P (diaphragm) relaxes and curve upwards air is forced out of the lungs.


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