Which of the following statements is not true for chylomicrons?

Options

A. Chylomicrons are formed inside the lumen of small intestine .
B. chylomicrons are protein coated fat droplets
C. Chylomicron contains triglycerides , cholesterol and phospholipids
D. Chylomicron released from epithelial cells of small intestine into lacteals.

Answer

To determine which statement is not true for chylomicrons, we need to analyze the characteristics and formation of chylomicrons in the body.

### Step-by-Step Solution:

1. **Definition of Chylomicrons**: Chylomicrons are lipoprotein particles that consist of triglycerides, cholesterol, phospholipids, and proteins. They are primarily responsible for transporting dietary lipids from the intestines to other locations in the body.

2. **Formation of Chylomicrons**: Chylomicrons are synthesized in the endoplasmic reticulum of enterocytes (the epithelial cells of the intestine) after the absorption of fatty acids and monoglycerides. They are not formed in the lumen of the small intestine.

3. **Components of Chylomicrons**: Chylomicrons contain triglycerides, cholesterol, and phospholipids, along with proteins that coat the fat droplets. This protein coating is essential for their transport in the lymphatic system.

4. **Transport Mechanism**: After their formation, chylomicrons are released from the enterocytes into the lymphatic capillaries (lacteals) and then transported through the lymphatic system to the bloodstream.

5. **Evaluating the Statements**:
- **Option 1**: "Chylomicrons are formed inside the lumen of the small intestine." - This statement is **not true** because chylomicrons are formed in the endoplasmic reticulum of enterocytes, not in the lumen.
- **Option 2**: "Chylomicrons are the protein-coated fat droplets." - This statement is **true**.
- **Option 3**: "Chylomicrons contain triglyceride, cholesterol, phospholipid." - This statement is **true**.
- **Option 4**: "Chylomicrons release from the epithelial cell into the lacteals." - This statement is **true**.

6. **Conclusion**: The statement that is not true for chylomicrons is Option 1, as they are formed in the endoplasmic reticulum of enterocytes, not in the lumen of the small intestine.

### Final Answer:
**The statement that is not true for chylomicrons is: "Chylomicrons are formed inside the lumen of the small intestine."**