The 5 zang organs include the heart (心), the liver (肝), the spleen (脾), the lung (肺), and the kidney (腎), and the 6 fu organs include the gallbladder (膽), the stomach (胃), the small intestine (小腸), the large intestine (大腸), the urinary bladder (膀胱), and sanjiao (the triple energizer).
The 5 zang organs and the 6 fu organs are all internal organs, but they differ in functions and characteristics. The main function of the 5 zang organs is “to store jing-qi (essence, 精氣)” which is the refined food nutrient responsible for maintenance of life activities.
The zangfu (simplified Chinese: 脏腑; traditional Chinese: 臟腑; pinyin: zàngfǔ) organs are functional entities stipulated by traditional Chinese medicine (TCM). These classifications are based on east Asian cosmological observations rather than bio medical definitions that are used in Western evidence based medical models. In TCM theory they represent the energetic representation of the internal organs rather than the anatomical viscera that is referred to in Western medicine.
Each zang is paired with a fu, and each pair is assigned to one of the wuxing 
. The zangfu are also connected to the twelve standard meridians – each yang meridian is attached to a fu organ and each yin meridian is attached to a zang. They are five systems of Heart, Liver, Spleen, Lung, Kidney.
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