The main functions of lungs are dominating qi (vital energy), controlling respiration, maintaining the smoothness of different vessels, and regulating water flow. The lung meridian communicates with the large intestine creating an exterior and interior relationship between these two organs.
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In western physiology, the lungs are responsible for air exchange. In addition to performing respiration in TCM, the lungs regulate fluid metabolism, blood circulation, the nervous and immune systems.
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Physiologically, kidney-qi must be strong and their astringent, grasping and holding functions must be sound, in order to have smooth respiration and a clear airway.
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