肺静脉 卜支气 a. 3. Lung 呼吸性细 支气管 paired organ,燃 肺泡管 located In thoracic cavity sexi 一肺泡囊 ∴一肺泡 终末網攴气管密∴∴ 钟泡囊 肺动脉3. Lung ---paired organ, located in thoracic cavity