Cholecystokinin acts on

Options

A. pancreas only
B. gall bladder only
C. pancreas and gall bladder
D. pituitary gland only

Answer

To solve the question "Cholecystokinin acts on," we need to analyze the function and target organs of the hormone cholecystokinin (CCK).

### Step-by-Step Solution:

1. **Understanding Cholecystokinin (CCK)**:
- Cholecystokinin is a peptide hormone that is produced in the gastrointestinal tract, specifically in the duodenum, in response to the presence of fats and proteins in the food.

2. **Identifying Target Organs**:
- CCK has specific target organs where it exerts its effects. The primary organs that respond to CCK are the pancreas and the gallbladder.

3. **Action on the Pancreas**:
- When CCK is released, it stimulates the pancreas to secrete digestive enzymes. These enzymes are crucial for the digestion of fats, proteins, and carbohydrates.

4. **Action on the Gallbladder**:
- CCK also stimulates the gallbladder to contract and release bile into the small intestine. Bile is essential for the emulsification and digestion of fats.

5. **Conclusion**:
- Based on the functions of cholecystokinin, we can conclude that it acts on both the pancreas and the gallbladder. Therefore, the correct answer to the question is that cholecystokinin acts on the pancreas and gallbladder.

### Final Answer:
Cholecystokinin acts on the pancreas and gallbladder.

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