Fatty acids and glycerol are not absorbed into the blood. Why?

Answer

### Step-by-Step Solution:

1. **Understanding Fatty Acids and Glycerol**:
- Fatty acids and glycerol are the products of lipid digestion. They are soluble in water, which means they can dissolve in aqueous solutions.

2. **Absorption Mechanism**:
- Although fatty acids and glycerol are soluble, they do not enter the bloodstream directly. This is primarily due to their hydrophobic nature and the structure of blood.

3. **Formation of Chylomicrons**:
- In the intestinal cells, fatty acids and glycerol are reassembled into triglycerides. These triglycerides are then packaged into larger lipoprotein particles called chylomicrons.

4. **Transportation of Chylomicrons**:
- Chylomicrons are too large to enter the blood capillaries directly. Instead, they are released into the lymphatic system, which eventually drains into the bloodstream.

5. **Conclusion**:
- Therefore, fatty acids and glycerol are not absorbed directly into the blood because they are reformed into triglycerides and packaged into chylomicrons, which are transported via the lymphatic system rather than directly entering the bloodstream.