Which organ is primarily related to the gastrointestinal tract?

The spleen is primarily related to the gastrointestinal tract due to its key role in the digestive and immune systems. In traditional Chinese medicine, the spleen is believed to influence the transformation and transportation of nutrients in the body, as well as to contribute to the overall health of the digestive system. It works closely with the stomach and other organs involved in digestion to ensure that food is broken down properly and nutrients are absorbed effectively.

The spleen's function is essential in filtering and maintaining a healthy environment within the gastrointestinal tract, supporting both digestion and metabolism. Unlike the other organs listed, which have different primary functions, the spleen's direct involvement in digestive processes highlights its critical connection to the gastrointestinal system.