肺はい循じゅん環かんはいじゅんかんMeanings1nounpulmonary circulationMedical term for the flow of blood from the heart to the lungs and back. Often contrasted with 体循環 (systemic circulation).See also: 体循環肺はい循じゅん環かんは、血けつ液えきに酸さん素そを取とり