What does it mean that the spleen governs Yang ascending and the liver governs Yin descending?

Spleen governs yang ascending and liver governs yin descending, which means that in the theory of traditional Chinese medicine, spleen is mainly responsible for yang ascending and liver is mainly responsible for yin descending. Because the spleen belongs to the soil, the soil is sincere, and it likes dryness and hates dampness, and the Yang Can rises; The liver belongs to wood, and it is wood, and it likes to drain, so that Yin Qi can drain. Therefore, spleen governing yang ascending and liver governing yin descending is a summary of the functional characteristics of five internal organs in TCM theory. Spleen governs yang ascending and liver governs yin descending, which means that in the theory of traditional Chinese medicine, spleen is mainly responsible for yang ascending and liver is mainly responsible for yin descending.