Question 1

Which of the following best describes the primary physiological role of high-density lipoprotein (HDL) in lipid metabolism?

Accepted Answer

HDL transports cholesterol from blood vessels to the liver for excretion or recycling.

Question 2

A patient with familial hypercholesterolemia is at increased risk for atherosclerosis due to which of the following mechanisms?

Accepted Answer

Elevated plasma LDL-C levels leading to lipid accumulation in arterial walls.

Question 3

Which lipoprotein is the major carrier of triglycerides (TGs) in the fasting state?

Accepted Answer

VLDL (Very Low-Density Lipoprotein)

Question 4

Based on their composition, which lipoprotein is the best target for triglyceride-lowering drugs?

Accepted Answer

VLDL

Question 5

Which of the following statements about lipoprotein density is correct?

Accepted Answer

The higher the protein content, the higher the density.

Question 6

A patient presents with elevated serum triglycerides. Which pathway is most likely to be upregulated?

Accepted Answer

VLDL secretion from the liver

Question 7

Which of the following best explains why decreasing serum triglycerides can lead to increased HDL cholesterol?

Accepted Answer

Less triglyceride is available for exchange with cholesterol on HDL, so HDL retains more cholesterol.

Question 8

Which of the following is a FALSE statement regarding lipoproteins?

Accepted Answer

LDL carries lipids from blood to liver.

Question 9

A patient with a low HDL to LDL ratio is at increased risk for which of the following conditions?

Accepted Answer

Atherosclerosis

Question 10

Which enzyme is responsible for hydrolyzing triglycerides in VLDL to free fatty acids for uptake by tissues?

Accepted Answer

Lipoprotein lipase (LPL)

Question 11

A defect in which of the following would most directly impair the clearance of LDL cholesterol from the blood?

Accepted Answer

LDL receptor

Question 12

Which of the following best describes the process of reverse cholesterol transport?

Accepted Answer

HDL collects cholesterol from peripheral tissues and delivers it to the liver.

Question 13

A patient with metabolic syndrome is found to have increased VLDL and decreased HDL. Which of the following best explains the increased risk of atherosclerosis in this patient?

Accepted Answer

Increased VLDL leads to more LDL formation and decreased HDL impairs reverse cholesterol transport.

Question 14

Which of the following is the correct sequence of events in the development of atherosclerosis?

Accepted Answer

Endothelial dysfunction → lipid accumulation in arterial wall → plaque formation

Question 15

Which of the following best explains why VLDL is considered a precursor to LDL?

Accepted Answer

VLDL loses triglycerides through lipase action, becoming IDL and then LDL.

Question 16

A patient is prescribed a drug that increases the conversion of cholesterol to bile acids. What is the expected effect on serum cholesterol levels?

Accepted Answer

Serum cholesterol levels will decrease.

Question 17

Which of the following best describes the role of the endothelium in vascular homeostasis?

Accepted Answer

It regulates vascular tone, blood flow, and provides an anti-coagulant surface.

Question 18

A patient with a mutation in the gene encoding CETP (cholesteryl ester transfer protein) would most likely have which of the following lipid profile changes?

Accepted Answer

Increased HDL cholesterol and decreased LDL cholesterol

Question 19

Which of the following equations correctly represents the relationship between lipoprotein density, protein content, and lipid content?

Accepted Answer

$$Density \propto \frac{Protein\ content}{Lipid\ content}$$

Question 20

A patient with atherosclerosis is found to have impaired reverse cholesterol transport. Which of the following is most likely decreased in this patient?

Accepted Answer

HDL-mediated cholesterol delivery to the liver

Physiology of Lipid Regulation and Atherosclerosis

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