Intercellular Digestion:
1. Digestion occurs in the food vacuoles within cells.
2. Lysosomal enzymes are secreted into the food vacuole.
3. Products of digestion diffuse into cytoplasm through vacuolar membrane.
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4. Ingestion occurs through pinocytic vesicle,e.g. protozoans, spongens and coeleneterates.
Extracellualr Digestion:
1. Digestion occurs outside of cells in the lumen of the alimentary canal.
2. Salivary, gastric pancreatic and intestinal enzymes are secreted into the digestive cavity.
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3. Digested food materials are absorbed into blood through gut epithelia.
4. Ingestion occurs through mouth, e.g. coelentarates to chordates.