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8 June, 00:36

Which of these structures is found in the stomach but nowhere else in the alimentary canal? a. a circular muscle layerb. mucus-forming cellsc. a lining of columnar epotheliumd. an onblique muscle layer

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  1. 8 June, 02:20
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    d. an onblique muscle layer

    Explanation:

    The alimentary canal has four main layers:

    Mucosa (innermost layer which surrounds the lumen), submucosa (connective tissue with blood vessels, lymphatics, and nerves), muscular layer, serosa (outermost layer of connective tissue).

    Muscular layer is subdivided into:

    • the inner - arranged in circular rings, prevents food from travelling backward

    • outer layer - arranged longitudinally, shortens the tract.

    The stomach has an extra layer called inner oblique muscular layer (churning function).
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