| To accomplish the bioassay, proliferating interstitial cells are labeled with BrdU by injecting BrdU into the gastrovascular cavity of the animal. |
| The archenteron becomes the gastrovascular system or coelenteron. |
| The mouth is prolonged by a short ½sophagus, the stomodeum, terminating in the gastrovascular cavity or c½lenteron, itself prolonged by a narrow canal to the end of each tentacle. |
| Individual polyps have eight feathery tentacles and, in the gastrovascular cavity, eight septa, or partitions. |
| It allows for the prolongation and inter-communication of gastrovascular cavities, the coelenterons. |
| This opens into the gastrovascular cavity, where digestion takes place and nutrients are absorbed. |
