Main lipid component of chylomicrons is
**Core Concept**
Chylomicrons are lipoprotein particles responsible for transporting dietary lipids from the intestines to the liver and peripheral tissues. The main lipid component of chylomicrons is triglycerides, which are synthesized in the intestinal cells and packaged into chylomicrons for transport.
**Why the Correct Answer is Right**
Triglycerides are the primary lipid component of chylomicrons, making up approximately 85-90% of their lipid content. This is due to the high levels of dietary fats that are absorbed by the intestines and packaged into chylomicrons for transport. The triglycerides in chylomicrons are rich in long-chain fatty acids, which are essential for energy production and storage in the body.
**Why Each Wrong Option is Incorrect**
**Option A:** Phospholipids are a minor component of chylomicrons, making up approximately 1-2% of their lipid content. While they are an essential component of the chylomicron membrane, they are not the main lipid component.
**Option B:** Cholesterol is a minor component of chylomicrons, making up approximately 2-5% of their lipid content. While it is an important component of the chylomicron membrane and is also transported in the bloodstream, it is not the main lipid component.
**Option C:** Free fatty acids are not a component of chylomicrons, as they are not packaged into lipoprotein particles for transport. Instead, they are released from adipose tissue and transported in the bloodstream bound to albumin.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the main lipid component of chylomicrons is triglycerides, which can contribute to the development of hypertriglyceridemia and pancreatitis if levels become too high.
**Correct Answer: C. Free fatty acids are not a component of chylomicrons.**