In Chinese Medicine, we concern about "Balance" and "Interaction". So, what is "Balance"? Balance within the body is about maintaining a dynamic balance between Yin and Yang, thus enabling the generation of Qi. On the other hand, what is Interaction? Interaction within the body is about the interactions among visceral organs under the Five Element Theory. The interaction among visceral organs are made possible by the ever-circulating Qi, such that the body can function normally. That's why we look at Balance and Interaction together. Let's talk about "Balance of Yin-Yang for generating Qi" in this video. Qi serves as an intangible driving force for the manifestation of body function. The concept Qi in Chinese Medicine covers a broad area in that it refers not only to the air one breathes in, but also to a form of energy. The manifestation of normal body functioning depends on whether or not a dynamic balance between Yin and Yang can be maintained in the body for generating Qi, which is referred to as Normal Qi. As mentioned in the video of basic theories, there are 3 sources from which Normal Qi is derived, namely, Primordial Qi, Grain Qi and Clean Air. We have also learnt briefly about the functional manifestations of different kinds of Qi. Now, I'm going to elaborate more on the function of different Qi. Primordial Qi, which is the primary driving force of human life, can be functionally related to pumping action of the heart That energizes the circulation of blood throughout the body. In fact, the beating heart is the earliest observable body function in a developing fetus. Primordial Qi works by driving the circulation of blood and Normal Qi throughout the body. Pectoral Qi results from the combination of inhaled clean air, that is oxygen, and ingested food, meaning nutrients. The digested and subsequently absorbed nutrients are first transported to the liver for incorporating or converting into biomolecules and cellular structures. In essence, Primordial Qi (Yang) interacts with Pectoral Qi (Yin) to form Normal Qi, which is comprised of Nutritive Qi and Defensive Qi. Nutritive Qi is responsible for nourishing visceral organs. In this regard, Nutritive Qi is related to the ability of tissues or cells to efficiently generate energy from nutrients, that is the efficiency of mitochondria, the powerhouse of the cell, to generate ATP, the energy currency of the cell, using fuel molecules. Finally, Defensive Qi is responsible for protecting the body against disease-causing external factors. This concludes the importance of "Balance of Yin-Yang for generating Qi".