What is the main function of the gastrovascular cavity?

Function of the gastrovascular cavity:

1. Gastrovascular cavity form the main organ of the digestive system
2. They are mainly found in phylum coelenterates or cnidarians.
3. It is mainly involves in digestion and circulations.
4. In coelenterates, gastrovascular cavity is called blind sac as the food passage and waste outlet has the same orifice.