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QUESTION
Q60) In Man the zymogen or chief cells are mainly found in...[CBSE 1990 ]

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The fundus of the stomach is the second part of the stomach. The rugae contain several specialized cells to help aid in digestion including parietal cells (HCl- Hydrochloric acid production by releasing H+ and Cl-), Chief cells (pepsin production by releasing pepsinogin which reacts with HCl to make pepsin), and Mucus cells (to release mucus and coat the stomach, protecting it from the low pH, high acid environment)
The main functions of the pylorus or are to prevent intestinal contents from reentering the stomach when the small intestine contracts and to limit the passage of large food particles or undigested material into the intestine.
The cardia is the first part of the stomach below the esophagus. It contains the cardiac sphincter, which is a thin ring of muscle that helps to prevent stomach contents from going back up into the esophagus

Answer : (d)