Which layer of the alimentary canal is exposed to the food we eat and ingest?

The correct answer is: mucosa

The alimentary canal or gastrointestinal tract consist of four layers: mucosa, submucosa, muscular layer and serosa.

Mucosa is the layer that surrounds the lumen, so it is exposed to the food . Mucosa is composed of epithelium (active in absorptive and secretory processes), lamina propria (connective tissue) and muscularis mucosa (peristaltic movement).

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