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In the GastroVascular Cavity
no.
The digestive enzyme-amylase is secreted in two regions of the digestive tract.i.e.(1) salivary amylase by salivary glands in the buccal cavity.(2) pancreatic amylase by pancreas in the duodenum.
A planarian is a non parasitic flatworm commonly found in ponds and rivers. Digestive enzymes are secreted from their mouth, then the pharynx moves the food to the gastrovascular cavity, where nutrients diffuse to the rest of the body.
The salivary glands work more. They produce more saliva. More enzymes are secreted. The saliva pass to the mouth cavity.
Peritoneum
peritoneal cavity
The abdominal cavity is where the digestive system, and other organs are housed.
A cavity that both digestive and circulatory serve are called cylindrical. This is the purpose of cnidarians.
faster transmission of nutrients thoughout the body
Perch have complete digestive systems
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)