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  3. Unit 5: energy, maintenance,
  4. The digestive system
  5. The stomach

23.4 The stomach  (Page 10/37)

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  • Card 10 / 37:
    Explain how the stomach is protected from self-digestion and why this is necessary.

    The mucosal barrier protects the stomach from self-digestion. It includes a thick coating of bicarbonate-rich mucus; the mucus is physically protective, and bicarbonate neutralizes gastric acid. Epithelial cells meet at tight junctions, which block gastric juice from penetrating the underlying tissue layers, and stem cells quickly replace sloughed off epithelial mucosal cells.

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Source:  OpenStax, Anatomy & Physiology. OpenStax CNX. Feb 04, 2016 Download for free at http://legacy.cnx.org/content/col11496/1.8
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