Digestion system of cockroach and earthworm
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The digestive system is partitioned into many regions, each with a certain function. The digestive system consists of the pharynx, the esophagus, the crop, the intestine and the gizzard. Food such as soil enters the earthworm's mouth where it is swallowed by the pharynx.
Cockroaches use their mandibles, or jaws, to bite and chew their food. From the mouth organs, the food passes into the foregut, or esophagus. The foregut opens into a crop, where undigested food is temporarily stored. ... The gastric sacks contain bacteria that the cockroach uses to digest its food.
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