Air flows from the posterior air sacs (posterior thoracic and abdominal air sacs) to the anterior air sacs (interclavicular, cervical and anterior thoracic air sacs) in both the inhale and exhale
normally when birds inhale. Half of the air passing through the posterior air sacs and the other half to pass into the lungs and air sacs in the anterior air sacs makes the whole body grow. And on the exhale Air bags are shrink the air from the anterior air sacs were driven out of the trachea, while the air is flowing into the posterior air sacs in the lungs and expulsion of breath. As the air flows through the one-way flow of air purifier that does not include the air that has not been bleached. The first time, therefore, more effective breathing mammal respiratory
alveoli in the lungs of a bird, like a mammal. But there is a structure called parabronchi replace many of which are equipped with air vesicles, called atria, and this area that the gas exchange occurs.
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