Kupffer cells are found in the liver, attached to the walls of the sinusoids. They are
1
tubular glands that secrete alkaline watery fluid, a little enzyme and mucus.
2
specialized macrophages that dispose of old blood cells and particulate matter.
3
epithelial cells that stimulate release of bile from gall bladder.
4
glandular cells that produce bicarbonate ions and somatostatin.