in alternated and endogenously synchronized phases of (i) food filtration, (ii) extracellular digestion (in the stomach) and, (iii) intracellular digestion (within the gland).
in alternated and endogenously synchronized phases of (i) food filtration, (ii) extracellulardigestion (in the stomach) and, (iii) intracellular digestion (within the gland).