Cholecystokinin is secretion of

Options

A. Duodenum that causes contraction of glass bladder
B. Goblet cells of ileum stimulates secretion of succus entricus
C. Liver and controls secondary sex characters
D. Stomach that stimulates pancreas to release juice

Answer

**Step-by-Step Solution:**

1. **Identify the Source of Cholecystokinin (CCK):**
- Cholecystokinin is a hormone that is secreted by specific cells in the digestive system.
- These cells are known as CCK cells, which are located in the duodenum, the first part of the small intestine.

2. **Understand the Function of Cholecystokinin:**
- The primary role of Cholecystokinin is to stimulate the contraction of the gallbladder.
- When the gallbladder contracts, it releases bile into the duodenum, which is essential for the digestion of fats.

3. **Evaluate the Options Provided:**
- **Option 1:** "Duodenum that causes contraction of gallbladder" - This option is correct as it accurately describes the source and function of Cholecystokinin.
- **Option 2:** "Goblet cells of ileum stimulate secretion of saccus antericus" - This is incorrect as goblet cells do not secrete Cholecystokinin.
- **Option 3:** "Liver and controls secondary sexual characters" - This is incorrect as the liver does not secrete Cholecystokinin.
- **Option 4:** "Stomach that stimulates pancreas to release juice" - This is also incorrect as the stomach does not secrete Cholecystokinin.

4. **Conclusion:**
- The correct answer is **Option 1**, which states that Cholecystokinin is a secretion of the duodenum that causes the contraction of the gallbladder.