Which part of the body does the spleen belong to?

The spleen is classified as part of the lymphatic system. This organ plays a crucial role in immune function and the filtration of blood. It helps to remove old or damaged red blood cells and assists in the production of white blood cells, which are vital for the body's immune response. Additionally, the spleen stores blood and helps to manage the body’s fluid balance.

In the context of the organ systems, the lymphatic system is primarily responsible for maintaining fluid balance, absorbing dietary fats from the digestive system, and providing a site for immune responses. The connections of the spleen with lymphatic tissues highlight its importance in the immune system and emphasize its role in counteracting infections.