What are the main differences between a digestive tract and a gastrovascular cavity?I know that the digestive tract has an opening for both a mouth as well as an anus, and it is found on more complex organisms, but are there any other main differences?
Posted by P. S. D
The digestion actually takes place cells lining the cavity by phagocytosis.
Once the food is inside the gastrovascular cavity, digestive enzymes are secreted into the cavity, and extracellular digestion begins. This extracellular digestion, largely limited to proteins in cnidarians, does not break down these substances completely to their constituent amino acids. As soon as the food has been reduced to small fragments, cells lining the gastrovascular cavity engulf them by phagocytosis, and digestion is completed intracellularly in food vacuoles.
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