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.