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Huangdi asked Qibo: When food and drink enter the mouth, they are transported to the intestines and stomach. The fluids derived from them differentiate into five types. In cold weather with thin clothing, they become urine and gas; in hot weather with thick clothing, they become sweat. Grief causes Qi to congregate, resulting in tears; internal heat with a relaxed stomach wall results in saliva. When pathogenic factors reverse internally, Qi becomes obstructed and fails to circulate. Failure of circulation leads to water distension (Shuizhang). I know these phenomena occur, but I do not understand their origin. I wish to hear the principle behind them.

Qibo replied: Food and drink enter the mouth, and their flavors are divided into five categories, each pouring into its respective "Sea" (where Qi and Blood gather). Jin (thin fluid) and Ye (thick fluid) travel along their specific pathways. Thus, Sanjiao (Triple Burner) emits Qi to warm the muscles and fill the skin; this is called Jin. What flows slowly and does not exit externally is called Ye. In hot weather with thick clothing, the Couli (pores and interstitial spaces) open, so sweat is excreted. Cold lingering between the Fenrou (muscle intervals) condenses into foam, causing pain. In cold weather, the Couli close, dampness-Qi cannot move outward, and water flows downward into the Bladder, becoming urine and gas. Among the Zang and Fu organs, the Heart is the ruler, the Ears are the listeners, the Eyes are the observers, the Lungs are the ministers, the Liver is the general, the Spleen is the defender, and the Kidneys govern the exterior. Therefore, the Jin and Ye of all Zang and Fu organs seep upward into the eyes. When one is sad, Qi congregates, causing the Xinmai (Heart Vessel) to contract tightly. Tight contraction of the Heart Vessel lifts the Lung. When the Lung is lifted, fluids overflow upward. However, the Heart Vessel and Lung cannot remain lifted constantly; they rise and fall intermittently, thus causing coughing and tearing. Internal heat causes rapid digestion of grain in the Stomach. Rapid digestion causes intestinal parasites to move up and down, filling and expanding the intestines and stomach, leading to a relaxed stomach wall. A relaxed stomach wall causes Qi to rebel upward, resulting in spitting saliva. The Jin and Ye from the five grains harmonize and combine to form a paste-like substance. This substance penetrates inward into the bone cavities to nourish the brain marrow and flows downward to the inner thighs. If Yin and Yang are disharmonious, fluids overflow and flow downward into the yin regions. Marrow fluids decrease and flow downward; excessive loss leads to deficiency. Deficiency causes lower back and waist pain and weakness in the shins. If the Qi and blood channels of Yin and Yang are blocked, the Four Seas are obstructed, Sanjiao fails to drain, and Jin and Ye fail to transform. Water and grain travel together within the intestines and stomach, separating at the Hui Chang (Lower Intestine), remaining in the Lower Jiao, and failing to渗 (seep) into the Bladder. This causes distension in the Lower Jiao. Overflowing water leads to water distension. This describes the normal and abnormal differentiation of the five types of Jin and Ye.

The question-and-answer structure here is unremarkable, and the wording lacks particular brilliance. "Wu Long" refers to the reversal of Qi as "Jue" and the reversal of Jin/Ye as "Long". "Jin Ye Bie" indicates that Jin and Ye differ in substance into five types.