The organelle that serves as the digestive system in the cell is the ____. polysome; endosome; lysosome; ribosome; intestine. Solution LYSOSOME: In the cell line: lysosome secretes thye lytic enzymes, and promotes the phagocytosis and digests the unwanted materials like bacteria etc, leading to formation of phagolysosomes. Therefore it can be called as the digestive system of the cell..