Question

True or False. Movement of injested food through the digestive system is unidirectional in animals using alimentary canals and in animals using gastrovascular cavities.

Answer 1

Movement of ingested food through the digestive system is unidirectional in animals using alimentary canals and in animals using gastrovascular cavities is False.

It is bidirectional because it enters the oral cavity from the bottom and exits the same way it entered, back toward its original location. Mammals are unidirectional in nature.

The mouth is where ingested material enters and travels through a hollow, tubular cavity. The cells lining the gastrovascular cavity take in the food particles.

An animal with an alimentary canal is something like an earthworm. Following ingestion through the mouth, food travels through the esophagus and is stored in the crop before entering the gizzard to be churned and digested. The food enters the intestine from the gizzard, where nutrients are absorbed and waste is expelled as casts through the anus.

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