Kaplan Nursing Entrance Practice Exam

What is the significance of chylomicrons in the lymphatic system?

1. They are a type of immune cell

2. They are involved in fat metabolism

3. They are responsible for transporting oxygen

4. They filter toxins from the blood

The correct answer is: They are involved in fat metabolism

Chylomicrons play a crucial role in fat metabolism within the lymphatic system. They are lipoprotein particles formed in the intestines after the digestion of dietary fats. Once fats are broken down into fatty acids and monoglycerides, these components are reassembled into triglycerides within the intestinal cells. Chylomicrons then transport these triglycerides, along with cholesterol and fat-soluble vitamins, from the intestines through the lymphatic system to the bloodstream. The lymphatic system facilitates the transport of chylomicrons as they need to enter the bloodstream without passing through the liver initially. This process is vital for distributing dietary lipids and ensuring that the body's energy needs are met while maintaining cellular functions. Other options do not accurately reflect the role of chylomicrons. They are not immune cells, nor do they transport oxygen or filter toxins from the blood. These functions are handled by different components of the immune and vascular systems.