Can the spleen serve as a reservoir for blood?

There is no clear cut answer for this. The spleen is part of the bodies system of destroying old red blood cells. They only live about 120 days. But the liver is responsible for most of the reclaiming of the iron to build new blood cells. Then., of course, not all the iron is retained, and some of it is expelled from the body in the feces, which is what gives it its reddish-brown color.