Lung (Chinese medicine)

Dominating qi has two aspects: dominating the qi of respiration and dominating the qi of the entire body. Dominating the qi of respiration means the lung is a respiratory organ through which the qi of the exterior and the qi from the interior are able to mingle. Via the lung, the body inhales clear qi from the natural environment and exhales waste qi from the interior of the body. Dominating qi of the entire body means that the function of the lung in respiration greatly influences the functional activities of the body, and is closely related to the formation of pectoral qi, which is formed from the combination of the essential qi of water and food, and the clear qi inhaled by the lung. When the lung's function of dominating qi is normal, the passage of qi will be unobstructed and respiration will be normal and smooth. Deficiency of lung qi may lead to general fatigue, feeble speech, weak respiration, shortness of breath and excessive perspiration.[2]

As a general rule, the upper zang-fu organs have the function of descending, and the lower zang-fu organs the function of ascending. Since the lung is the uppermost zang organ, its qi descends to promote the circulation of qi and body fluid through the body and to conduct them downwards. Dysfunction of the lung in descending may lead to upward perversion of lung qi with symptoms such as cough and shortness of breath.

Regulating the water passages means to regulate the pathways for the circulation and excretion of water. Circulation of body fluids is a function of many organs working together as a team, including the lungs. The role of the lung in promoting and maintaining water metabolism depends on the descending function of lung qi. Under normal circumstances, the lungs are capable of sending fluids downwards to the kidneys, which pass the fluids to the bladder for excretion. Dysfunction may result in dysuria, oliguria, and oedema.[3]