The lungs, including the two lobes, one on the left and right separately, are situated in the thorax. They are compared to the "cапоpy" because of its uppermost position among all the zang-fu organs. They are also termed "delicate zang organs".

The lungs dominate qi and respiration. They are the place of exchange between the gases inside and outside the body. Basic Questions (Su Wen ) says, "atmosphere communicating to the lungs". The lungs also govern dispersing and descending, and regulates water passage, and communicate with numerous vessels to coordinate functional activities of the whole body, assisting the heart to adjust normal circulation of qi and blood. The lungs corresponds to melancholy in the emotions and are related to the skin and hair externally. They open into the nose and their conditions are reflected on vellum hairs. In the meridian-collateral relation, the lungs and the large intestine are exteriorly-interiorly related because of interconnecting - interpertaining of the Lung Meridian of Hand-Taiyin and the Large Intestine Meridian of Hand-Yang-ming.

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