Final answer:
The spleen has multiple functions, including acting as a blood reservoir, participating in tissue repair through hematopoiesis, and filtering the blood to remove damaged cells and foreign substances.
Step-by-step explanation:
The spleen has several functions in the body. It acts as a blood reservoir, storing a reserve of blood in case of an emergency such as significant blood loss. The spleen also plays a role in tissue repair by producing new blood cells and platelets through a process called hematopoiesis. Additionally, the spleen filters the blood to remove damaged red blood cells and platelets, as well as foreign substances and antibody-complexed pathogens, contributing to its function as part of the immune system.