The body cavity of animals of the order Nidaria is called a coelenteron. The body cavity of the Hydra is the Cilantron. Archenteron transforms into Cilenteron. It is covered by gastrodermis. It involves extracellular digestion. Food and excreta are transported through it. Hence it is called Gastrovascular cavity. Cilantron is sometimes called blind gut or blind sac. It is exposed through the stoma. Takes food and leaves waste through mouth. Dr. Siddiq Publications
Why Coelenteron is called digestive circulation
Both alimentary canal and body cavity functions of Nidaria are carried out by cilantrones. Cilenterone performs physiological functions such as digestion, transport of nutrients, respiration, excretion, excretion of waste products, etc. Food material is taken up in the cilantro and extracellular and intracellular digestion is carried out. Undigested food and waste products are excreted through the stomata. So Cilenteron is called Gastrovascular cavity or Gastrovascular cavity. Dr. Siddiq Publications
Importance of Coelenteron
1. Cilantron contains food.
2. It causes extracellular digestion.
3. Food and excreta are transported through it.
4. It excretes waste through the stoma.