The zàng-fǔ () constitute the centre piece of TCM's systematization of bodily functions.
The term zàng (臟) refers to the five entities considered to be yin in nature-Heart, Liver, Spleen, Lung, Kidney-, while fǔ (腑) refers to the six yang organs-Small Intestine, Large Intestine, Gallbladder, Urinary Bladder, Stomach and Sānjiaō [REF].