_____hormone is released from stomach while____ is released from duodenum.

Explanation

To answer the question, we need to identify the hormones released from two specific parts of the digestive system: the stomach and the duodenum.

1. **Identify the hormone released from the stomach**:
The hormone released from the stomach is called **gastrin**. Gastrin is produced by G-cells located in the gastric mucosa. Its primary function is to stimulate the secretion of gastric acid (HCl) from the parietal cells in the stomach, which aids in the digestion of food.

2. **Identify the hormone released from the duodenum**:
The hormone released from the duodenum is known as **cholecystokinin (CCK)**. Cholecystokinin is produced by I-cells in the lining of the duodenum. This hormone plays a crucial role in digestion by stimulating the gallbladder to release bile and the pancreas to secrete digestive enzymes. It also helps regulate appetite.

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