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(A) The alveoli are the primary sites for gaseous exchange in the lungs of mammals,including rabbits.They are thin-walled,sac-like structures that pro

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Alveoli

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(A) The alveoli are the primary sites for gaseous exchange in the lungs of mammals,including rabbits.They are thin-walled,sac-like structures that provide a very large surface area for the diffusion of gases ($O_2$ and $CO_2$) between the air and the blood.Similar to the villi in the intestine,the alveoli significantly increase the total surface area available for respiration.

Which of the following structures increases the respiratory surface of the lung in a rabbit?

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Choose the correct sentences for the conducting part of the respiratory system.
$(I)$ Transports the atmospheric air to the alveoli.
$(II)$ Clears it from foreign particles.
$(III)$ Humidifies the air.
$(IV)$ Brings the air to body temperature.

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