Question at position 13 Which of the following lipoproteins normally returns most of the cholesterol to the liver for disposal via reverse transport?ChylomicronsVLDLLDLHDL

Question

BlackTom AI · Accepted Answer

Restating the question and options: The question asks which lipoprotein normally returns most of the cholesterol to the liver for disposal via reverse cholesterol transport. The options are: Chylomicrons, VLDL, LDL, HDL.

Option 1 — Chylomicrons: These lipoproteins are primarily involved in transporting dietary triglycerides from the intestine to tissues after a meal. They carry minimal cholesterol back to the liver, and their main role is not reverse cholesterol transport. This makes this option incorrect for the stated function.

Option 2 — VLDL: Very-low-density lipoprotein carries endogenous triglycerides from the liver to peripheral tissues. While it does contain cholesterol, its principal role is triglyceride transport, and it is not the main vehicle for reverse cholesterol transport. Therefore this choice is not correct.

Option 3 — LDL: Low-density lipoprotein is rich in cholesterol and delivers cholesterol to peripheral tissues. It is often implicated in atherogenesis when in excess, but it is not the particle responsible for returning cholesterol to the liver for disposal. Thus, this option does not describe reverse cholesterol transport.

Option 4 — HDL: High-density lipoprotein is the key player in reverse cholesterol transport. It scavenges cholesterol from peripheral cells and macrophages and delivers it back to the liver for excretion or reuse, which is the classic reverse cholesterol transport pathway. This makes HDL the correct description for the question’s function.

Putting the pieces together: The question emphasizes the return of cholesterol to the liver for disposal, which is characteristic of HDL activity in reverse cholesterol transport, rather than the roles of chylomicrons, VLDL, or LDL in dietary/triglyceride transport or cholesterol delivery to tissues.

Summary of incorrect options: Chylomicrons do not primarily mediate reverse transport; VLDL’s function is endogenous triglyceride delivery; LDL is a cholesterol-delivery particle to tissues and is not the main reverse transporter. Each of these facts conflicts with the stated mechanism, supporting why they are not correct.

Summary of the correct option: HDL’s role in reverse cholesterol transport aligns precisely with the question’s description, making it the appropriate choice based on established lipoprotein physiology.

Question at position 13 Which of the following lipoproteins normally returns most of the cholesterol to the liver for disposal via reverse transport?ChylomicronsVLDLLDLHDL

查看解析

登录即可查看完整答案

类似问题

Spherical complexes of emulsified fats are known as:

What is found in a typical Chylomicron or Very Low Density Lipoprotein Particle in blood?

The primary component of chylomicrons is

Which is NOT a lipoprotein?

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

People born without creativity never can develop it

A product has a selling price of $20, a contribution margin ratio of 40% and fixed cost of $120,000. To make a profit of $30,000. The number of units that must be sold is: Type the number without $ and a comma. Eg: 20000

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单