It consists of the following parts: ADVERTISEMENTS: (a) Mouth: It is terminal crescentic aperture in the peristomium and overhung by prostomium. An earthworm may appear crude and simple, but they are actually very complex. Instead of having a small and large intestine, worms have only one.

The digestive system of earthworm consists of the alimentary canal and the digestive glands.
Digestive System. Worms have a very special digestive system. Digestive System of Earthworm Anatomy of Earthworm,Cockroach & Frog of Class 11 . The alimentary canal is a straight tube running throughout the length of the body from the mouth to the anus. The main excretory organ is nephridia. It can be divided into following parts : Mouth : A crescentic aperture ventral to the prostomium and situated in the first segment or peristomium or buccal segment. The path of digestion begins at the mouth. Digestive system of the earthworm consists of alimentary canal (mouth, buccal cavity, pharynx, oesophagus, gizzard, stomach, intestine and anus) and digestive glands (pharyngeal gland, gastric epithelium, intestinal epithelium and intestinal caecae). Like all heterotrophs, earthworms cannot manufacture their food, but must eat and digest their food for energy. Alimentary Canal : A straight tube running throughout the length of the body. An earthworm’s digestive system. Blood vascular system of earthworm is of closed type.
Earthworms are both ammonotelic and ureotelic. And it is called an intestine.


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