Because of the animal's body bodies moving quickly, such as running flight and sent the vocals. The body must use oxygen for life. Therefore, the respiratory system of poultry must therefore be developed which differ from mammals. On the exhale each time it is necessary to make the air remains in the lungs. In order to receive oxygen and breathing the most. Structure of the respiratory system that is different from other animals. Lung tissue is smaller than, but embedded in the slot of the rib, and the expansion is less, but the poultry will have an airbag is connected inside the chest and abdomen, in total 9 (bag) or dual airbags, 4 and 1 large bag these airbags related to bring oxygen into the body, but does not involve the exchange of oxygen and carbon dioxide gas. Air bags, it will connect to the lungs and bones that are hollow manner (pneumatic bone) that is associated with breathing and allows the body's structure, suitable flight.
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