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23 August, 20:42

Which layer of the digestive tract controls digestive propulsion?

A. serosa

B. mucosa

C. submucosa

D. muscularis externa

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Answers (1)
  1. 23 August, 22:35
    0
    D. muscularis externa

    Explanation:

    The gastrointestinal tract or digestive tract consist of four main layers:

    • Mucosa - consists of the epithelium together with glandular tissue and the lamina propria (connective tissue)

    • Submuscosa - consists of fibrous connective tissue with larger blood vessels, lymphatics, nerves ...

    • Muscularis externa-smooth muscle layer that consists of three layers, responsible for movement (propulsion) and physical break down of the food

    • Serosa-consists of connective tissue continuous with the peritoneum.
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