Macrophages (blue) doing “their work” in the central vein of a mouse liver. Kupffer cells are reticuloendothelial cells (macrophages) resident in the liver sinusoids that scavenge damaged red-blood cells and bacteria as they pass through. Hundreds of millions of red-blood cells are removed by the reticuloendothelial system every minute.
Image Courtesy of Hendrik Herrmann, Anscharhöhe, Hamburg, HH, DE.
(Source: Flickr / fei_company)