For ten points, name this organ whose white pulp synthesizes antibodies and whose red pulp filters red blood cells.
The absence of the HOX11 gene prevents this organ from developing. A disease whose two other main symptoms are rheumatoid arthritis and neutropenia has enlargement of this organ as a third symptom; that is Felty's triad. That enlargement of this organ can be found by percussing the lowest intercostal space and seeing if the note changes from resonant to dull. That is (*) Castell's sign. Loss of this organ increases susceptibility to pneumococcus, meningococcus, and other encapsulated bacteria. The cords of Billroth are found in this organ and it is often enlarged and fragile in mononucleosis. Sickle cell anemia can cause sequestration of this organ, which is present on the left side of the abdomen. For ten points, name this organ whose white pulp synthesizes antibodies and whose red pulp filters red blood cells.
The absence of the HOX11 gene prevents this organ from developing.
spleen