What is lung and large intestine phase inside and outside

The lung and large intestine are exterior-interior, and the lung and large intestine are interconnected through meridians to form exterior-interior relationship. The descending of lung qi contributes to the exertion of the conduction function of the large intestine, while the normal conduction function of the large intestine contributes to the descending of lung qi. In terms of pathology, if the large intestine is overheated and the fu-qi is blocked, the lung can lose its descending, resulting in chest fullness, cough and asthma; if the lung loses its descending, the body fluid cannot be released, resulting in dry stool; Lung qi weakness, large intestine transmission weakness, can show qi deficiency constipation, stool difficult and not.