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Secretin and cholecystokinin are two hormones involved in digestion. They are secreted by

1. Duodenum
2. Ileum
3. Oesophagus
4. Stomach

Correct answer: Duodenum

Solution

Secretin and cholecystokinin (CCK) are produced by enteroendocrine cells in the duodenum. This makes sense because the duodenum is the first site where chyme is sensed and digestive secretions are coordinated.

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