Respiration in the Frog

    Gas exchange between the air and bloodstream occurs in three locations in the frog: 1)  the skin, 2) the lining of the mouth and 3) the lungs.

    In order to ventilate the  frog uses its throat to pump air into the lungs.  Breathing occurs in four steps:

    1.    The throat moves down drawing air into the mouth through the nostils.

    2.    The nostrils close and the throat moves up, forcing air into the lungs.

    3.    The throat moves down drawing air back out of the lungs.

    4.    The nostrils open and the throat moves up, forcing air out of the frog.

    Repeat.

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