Cholecystokinin is secretion of

Options

A. Duodenum that causes contraction of gall 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. **Understanding Cholecystokinin (CCK):**
- Cholecystokinin is a hormone that plays a crucial role in digestion, particularly in the regulation of bile and pancreatic juice secretion.

2. **Identifying the Source of CCK:**
- CCK is secreted by the Brunner's glands, which are located in the duodenum, the first part of the small intestine.

3. **Function of CCK:**
- The primary function of CCK is to stimulate the contraction of the gallbladder, which stores bile. This contraction helps release bile into the small intestine to aid in the digestion of fats.

4. **Evaluating the Options:**
- Option 1: "Deodorant that causes contraction of gallbladder" - This is correct as CCK causes gallbladder contraction.
- Option 2: "Goblet cells of ileum stimulate secretion of succus entericus" - This is incorrect; goblet cells do not secrete CCK.
- Option 3: "Liver and controls secondary sex characters" - This is incorrect; the liver does not secrete CCK, and CCK does not control secondary sex characteristics.
- Option 4: "Stomach that stimulates pancreas to release juice" - This is incorrect; while the stomach does play a role in digestion, it is not the source of CCK.

5. **Conclusion:**
- Based on the information, the correct answer is **Option 1**, as cholecystokinin is secreted by the duodenum and causes the contraction of the gallbladder.