MCAT Question of the Day
    •

    Q:

    		 Which of the following occurs during expiration?
    		 

    A

    		 increase of air pressure in the lung relative to the environment

    B

    		 contraction of the diaphragm

    C

    		 contraction of external intercostal muscles

    D

    		 increase in volume of the thoracic cavity



    Respiratory System |
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