What does the spleen do?
The spleen serves as a repository for lymphocytes, the white blood cells that produce antibodies to foreign substances ("antigens"), such as bacteria and viruses, to eliminate these threats. The area of the spleen which houses the white blood cells is called the "white pulp".
After circulating through the lymph vessels throughout the body to patrol for invaders, the white cells congregate in the spleen.
Many types of lymphoid cells congregate there, including B lymphocytes, T lymphocytes, and the macrophages that present antigens to them.
New red blood cells and other types of blood cells are constantly being produced in the bone marrow; the spleen also contains "red pulp", where blood cells being retired are broken down.
Is the spleen necessary?
The spleen is not absolutely necessary for survival; however, people whose spleens have been removed