What does the propaganda function of lung mean?

The expansion of the lung means that the lung distributes nutrients necessary for human metabolism to the whole body and keeps the airway unobstructed. Through the declaration of lung qi, qi is distributed to the whole body, and Shui Gu's essence is transmitted from the spleen to the lungs and to the whole body. The distribution of qi is to protect the skin and reach the fur, thus warming the meat, nourishing the skin and conditioning the skin.