(2005? Ningxiang county simulation is a schematic diagram of bird airbag distribution. Please fill in the structure name and function: (1) and write down the names of all parts.

The breathing mode of domestic pigeons is double breathing, which is a unique breathing mode of birds.

(1) The respiratory system of domestic pigeons includes trachea, lungs, airbags and other organs, such as: ① trachea; ② Airbag; ③ Lung

(2) There are many air sacs in pigeons, which communicate with the lungs. When pigeons inhale, air enters the lungs, where gas exchange takes place, and at the same time, part of the air enters the airbag for temporary storage. When exhaling, the gas in the airbag enters the lungs again and exchanges gas in the lungs. In this way, every time the pigeon breathes, the gas enters the lungs twice and exchanges gas in the lungs twice. This way of breathing is called double breathing. Double breathing is a unique breathing mode of birds, which greatly improves the efficiency of gas exchange.

So the answer is: (1)① trachea; ② Airbag; ③ Lung

(2) lungs; oxygen

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