The pectoral qi is a kind of essential qi in the body. Since it is produced after birth, it is a kind of acquired essential qi.
The pectoral qi accumulates in the chest. When transported from the chest, it is divided into ying-qi (the nutrient qi) and wei-qi (the defensive qi) which are distributed to the whole body.
Production of Pectoral Qi
The pectoral qi is produced by combining the fresh air inhaled by the lung with the food nutrients absorbed and transported by the spleen. The respiratory function of the lung and the transporting and transforming functions of the spleen influence the production of the pectoral qi.
Distribution of Pectoral Qi
Since the pectoral qi accumulates in the chest, the chest is called "the sea of qi". Because the heart and the tung are located in the chest, the pectoral qi infuses into the heart and the lung and flows in the vessels and respiratory tract. So the state of the pectoral qi influences the functions of the heart vessels, the lung and the respiratory tract.
Characteristics of Pectoral Qi
The pectoral qi has two functions. One is to warm and nourish the heart vessels to maintain their functions in transporting qi and blood. The other is to warm and nourish the lung and the upper respiratory tract to maintain their functions in governing respiration and vocalization. If the pectoral qi is insufficient, it will lead to palpitation, shortness of breath and weak voice, etc.