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 has a genetic defect in the LDL receptor. Which of the following is the most likely consequence?

Accepted Answer

Decreased clearance of LDL from the blood, resulting in elevated plasma cholesterol.

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 lipoproteins is FALSE?

Accepted Answer

LDL carries lipids from blood to the liver.

Question 6

A patient has elevated plasma LDL and low HDL. Which of the following best describes their risk for atherosclerosis?

Accepted Answer

Increased risk due to high LDL and low HDL.

Question 7

Which process is most directly responsible for the conversion of VLDL to LDL in the bloodstream?

Accepted Answer

Loss of triglycerides via lipoprotein lipase activity.

Question 8

Which of the following best explains why decreasing serum triglycerides often leads to increased HDL cholesterol?

Accepted Answer

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

Question 9

Which of the following is a key function of the vascular endothelium in preventing atherosclerosis?

Accepted Answer

Maintaining a non-coagulant surface and regulating vascular tone.

Question 10

A patient is prescribed a drug that upregulates LDL receptor expression in hepatocytes. What is the expected effect on plasma LDL cholesterol?

Accepted Answer

Plasma LDL cholesterol will decrease.

Question 11

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

Accepted Answer

HDL collects cholesterol from tissues and returns it to the liver.

Question 12

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

Accepted Answer

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

Question 13

A patient with metabolic syndrome has elevated VLDL and low HDL. Which of the following best explains the increased risk of atherosclerosis in this patient?

Accepted Answer

Elevated VLDL increases serum triglycerides, and low HDL reduces reverse cholesterol transport.

Question 14

Which of the following best describes the fate of cholesterol delivered to the liver by HDL?

Accepted Answer

It is excreted as bile acids or recycled.

Question 15

A patient with atherosclerosis is found to have endothelial dysfunction. Which of the following is a likely consequence?

Accepted Answer

Decreased regulation of vascular tone and increased risk of plaque formation.

Question 16

Which of the following best explains why elevations in any lipoprotein can lead to atherosclerosis?

Accepted Answer

Elevated lipoproteins increase the delivery of cholesterol and triglycerides to the arterial wall.

Question 17

Which of the following best describes the role of lipoprotein lipase (LPL) in lipid metabolism?

Accepted Answer

LPL hydrolyzes triglycerides in chylomicrons and VLDL, releasing free fatty acids for tissue uptake.

Question 18

A patient is found to have a high ratio of HDL to LDL. Which of the following is most likely true?

Accepted Answer

They are less likely to develop atherosclerosis.

Question 19

Which of the following best describes the process by which LDL delivers cholesterol to cells?

Accepted Answer

LDL binds to LDL receptors on cell surfaces, is endocytosed, and degraded in lysosomes to release cholesterol.

Question 20

Which of the following is the most likely outcome if the conversion of cholesterol to bile acids in the liver is increased?

Accepted Answer

Plasma cholesterol levels will decrease.

Physiology of Lipid Regulation and Atherosclerosis: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards