peritoneal cavity
Both subdivisions of the ventral body cavity (thoracic cavity and abdominopelvic cavity) contain the respiratory system, cardiovascular system, and digestive system.
A cavity that both digestive and circulatory serve are called cylindrical. This is the purpose of cnidarians.
The abdominal cavity is where the digestive system, and other organs are housed.
A gastrovascular cavity is a digestive sac with only a single opening. A complete digestive tract (otherwise known as an Alimentary canal) has two openings (a mouth and anus) between its digestive tubes unlike the gastrovascular cavity in which food is ingested and eliminated through the same opening (example would be hydra)
The peritoneal cavity surrounds the digestive organs in the abdominal cavity. This cavity is lined by a serous membrane called the peritoneum, which helps support and protect the abdominal organs. It contains fluid that reduces friction between the organs during movement.
Peritoneum
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Extracellularly in a digestive cavity.
Jellyfish have a simple digestive system. They have a digestive cavity with cells lining the wall that carry out the digestive function.
A digestive chamber with one opening is called a gastrovascular cavity. This structure is typically found in simple organisms such as cnidarians and flatworms, where it serves both digestive and circulatory functions.