thumb|right|The spleen contains two different tissues, white pulp (A) and red pulp (B). The white pulp functions in producing and growing immune and blood cells. The red pulp functions in filtering blood of antigens, microorganisms, and defective or worn-out red blood cells.
thumb|right|the spleen contains two different tissues white pulp (a) and red pulp (b) the white pulp functions in producing and growing immune and blood cells the red pulp functions in filtering blood of antigens microorganisms and defective or worn-out red blood cells