Cholecystokinin and duocrinin are secreted by

Options

A. Adrenal cortex
B. Thyroid gland
C. Intestine
D. Pancreas

Answer

**Step-by-Step Solution:**

1. **Identify the Hormones**: The question asks about the secretion of two hormones: cholecystokinin and duocrinin.

2. **Understand the Function of Each Hormone**:
- **Cholecystokinin (CCK)**: This hormone is released when food enters the duodenum (the first part of the small intestine). It stimulates the gallbladder to release bile and the pancreas to secrete digestive enzymes, aiding in digestion.
- **Duocrinin**: This hormone helps protect the duodenum from the acidic digestive enzymes that are secreted by the stomach.

3. **Evaluate the Options**:
- **Adrenal Cortex**: This part of the adrenal gland produces hormones like adrenaline, which are not related to digestion. Therefore, this option is incorrect.
- **Thyroid Gland**: This gland primarily secretes thyroxine, which regulates metabolism and is not involved in the secretion of CCK or duocrinin. Thus, this option is also incorrect.
- **Pancreas**: While the pancreas plays a crucial role in digestion by secreting insulin, glucagon, and somatostatin, it does not secrete cholecystokinin or duocrinin. Therefore, this option is incorrect.
- **Intestine**: Both cholecystokinin and duocrinin are secreted by the intestine, specifically in response to the presence of food in the duodenum.

4. **Conclusion**: The correct answer is that cholecystokinin and duocrinin are secreted by the intestine.

**Final Answer**: Intestine

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