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The acidic mucin from mucous neck cells helps maintain the acidic conditions resulting from the secretion of acid by parietal cells.

Question

The acidic mucin from mucous neck cells helps maintain the acidic conditions resulting from the secretion of acid by parietal cells.

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Solution

The acidic mucin produced by the mucous neck cells plays a crucial role in maintaining the acidic environment in the stomach. This is primarily due to the secretion of hydrochloric acid by the parietal cells. Here's a step-by-step explanation:

  1. The stomach lining contains various types of cells, including parietal cells and mucous neck cells.

  2. Parietal cells are responsible for producing hydrochloric acid (HCl). This acid is essential for the digestion process as it helps break down food particles and activates digestive enzymes.

  3. However, the high acidity of HCl can potentially damage the stomach lining. This is where the mucous neck cells come into play.

  4. Mucous neck cells produce a substance known as acidic mucin. This substance is a type of mucus that has a slightly acidic pH.

  5. The acidic mucin forms a protective layer over the stomach lining. This layer prevents the hydrochloric acid from directly contacting and damaging the stomach tissue.

  6. Therefore, the acidic mucin from mucous neck cells helps maintain the acidic conditions in the stomach, protecting it from the potentially harmful effects of the acid produced by parietal cells.

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