________ are fixed macrophages found in the liver.
An important cell in the immune system. Macrophages are scavenging cells, large PHAGOCYTES derived from blood MONOCYTES, and are found all over the body, especially in the liver, lymph nodes, spleen and bone marrow. Some are stationary within the tissues (fixed macrophages), others are free and move about, being attracted to sites of infection. Connective tissue (fixed) macrophages are called histiocytes; those in the liver are called Kupffer cells; and those in the nervous system are called microglial cells.