Question

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lo 5.1. what do chief cells secrete?
pepsinogen, which is converted to pepsin, an enzyme that breaks down proteins.
hcl, which is an enzyme that breaks down proteins.
amylase, which is an enzyme that breaks down carbohydrates.
lipase, which is an enzyme that breaks down fats.
mucus, which protects the stomach lining from acid damage.

Explanation:

Chief cells in the stomach secrete pepsinogen. Pepsinogen is an inactive enzyme precursor. When it comes into contact with hydrochloric acid (HCl) in the stomach, it is converted to pepsin. Pepsin is an active enzyme that breaks down proteins.

• HCl is secreted by parietal cells, not chief cells.
• Amylase is mainly associated with carbohydrate digestion and is not secreted by chief cells.
• Lipase for fat digestion has different sources (e.g., pancreatic lipase) and is not secreted by chief cells.
• Mucus is secreted by mucus - neck cells and other mucus - secreting cells in the stomach, not chief cells.

Answer:

Pepsinogen, which is converted to pepsin, an enzyme that breaks down proteins.