This course introduces TCM's understanding of human physiology. Zangxiang refers to the internal organs hidden in the body, the physiological and pathological signs that appear outside, and the things and phenomena that correspond to the natural world. "Zang" refers to the internal organs hidden in the body. In fact, five physiological and pathological systems centered on the five internal organs include the five internal organs, the six fu-organs and the Qiheng's internal organs. "Xiang" is the external phenomenon and comparison of the five physiological and pathological systems.