function of crypts of lieberkuhn
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Explanation:
1. Secret inactivated pepsin
2. Secret Hydrochloric acid (to lower pH and activate pepsin)
3. Secret mucus (to protect epithelial cells)
The inactivated pepsin is secreted at the bottom of the crypt, and is activated by hydrochloric acid, which is secreted at the top. This is to prevent the cells lining the crypt from being digested by the pepsin. The cells towards the top of the crypt are protected by a coating of mucus.
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