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The enzyme pepsin is secreted by the ________ in the stomach.
- Liver
- Pancreas
- Gastric glands
- Salivary glands
Answer: Gastric glands
Gastric glands in the stomach lining secrete pepsinogen, which converts to active pepsin in acidic environment. Pepsin breaks down proteins into peptides, initiating protein digestion. This is a key concept in human physiology. [[NCERT Biology Class 11]]