What is the major function of the stomach when it works with the spleen?

The major function of the stomach in conjunction with the spleen is centered around the digestion and absorption of nutrients. In traditional Chinese medicine, the stomach is responsible for breaking down food into its simplest forms, which is crucial for nutrient extraction. This process not only involves the physical and chemical breakdown of food but also sets the foundation for the spleen's role, which is primarily to transform and transport those nutrients throughout the body.

In this cooperative dynamic, the stomach acts as the initial site where food is processed, and the spleen further refines these nutrients, ensuring they are effectively utilized for energy, growth, and maintenance of bodily functions. This synergy illustrates how these two organs complement each other, emphasizing their interconnectedness in regulating digestion and overall nourishment.

Other options such as absorption of essential substances, separation of clear and turbid digestion, and fluid content absorption from waste do not capture the full scope of the stomach and spleen's collaborative function in the digestive process as effectively as the primary role of digestion and absorption of nutrients does.