<prompt> Function of Kupffer cells in liver isPhagocyticLyticSecretoryExcretory  <response>: Kupffer cells KC constitute 80-90 of the tissue macrophages present in the body. They reside within the lumen of the liver sinusoids and are therefore constantly exposed to gut-derived bacteria, microbial debris, and bacterial endotoxins, known to activate macrophages has got phagocytic action. Ref: Medical Physiology, Indu Khurana 