Digestive System, Invertebrate, Vacuolar systems

Unicellular organisms that ingest food particles via vacuoles rely on intracellular digestion to prepare the nutrients for use. The enzymes that catalyze this digestion, being very potent chemicals capable of breaking down the cell substance itself, are held until needed in special packets, or vesicles, called lysosomes; the membrane of a lysosome is both impermeable