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** Parietal cells and zymogen cells are produced at a slower rate; the parietal cells have a half-life of 23 days.  
 
** Parietal cells and zymogen cells are produced at a slower rate; the parietal cells have a half-life of 23 days.  
   −
===Defence Mechanisms===
+
==Defence Mechanisms==
 
# Secretions :
 
# Secretions :
 
#* Mucus (inhibits contact with mucosa, protects surface).
 
#* Mucus (inhibits contact with mucosa, protects surface).
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