Concept of Qi ● Wide meaning: Narrow meaning: 0 Vital substances Physiological comprising the functions of human body and Zang-fu organs, maintaining its meridians and life activities collaterals Concept of Qi ⚫ Wide meaning: Vital substances comprising the human body and maintaining its life activities ⚫ Narrow meaning: Physiological functions of Zang-fu organs, meridians and collaterals