Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

24. Lipid Metabolism

Lipoproteins for Transport

GOB Chemistry

24. Lipid Metabolism

Lipoproteins for Transport

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3:03 minutes

Problem 68

Textbook Question

Lipoproteins that transport lipids from the diet are described as exogenous. Those that transport lipids produced in metabolic pathways are described as endogenous. Which of the following lipoproteins transports exogenous lipids and which transports endogenous lipids?
a. Low-density lipoprotein (LDL)
b. Chylomicrons

Verified step by step guidance

Understand the key terms: Exogenous lipids are those obtained from the diet, while endogenous lipids are those synthesized within the body through metabolic pathways.

Recall the function of chylomicrons: Chylomicrons are lipoproteins that transport dietary (exogenous) lipids, such as triglycerides, from the intestines to other tissues in the body.

Recall the function of low-density lipoprotein (LDL): LDL is a lipoprotein that primarily transports cholesterol, which is synthesized in the liver (endogenous), to peripheral tissues.

Classify chylomicrons: Based on their role in transporting dietary lipids, chylomicrons are responsible for transporting exogenous lipids.

Classify LDL: Based on its role in transporting cholesterol produced in the body, LDL is responsible for transporting endogenous lipids.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Lipoproteins

Lipoproteins are complex particles composed of lipids and proteins that transport fats through the bloodstream. They vary in density and function, with different types responsible for carrying either dietary lipids (exogenous) or lipids synthesized by the body (endogenous). Understanding the role of lipoproteins is crucial for grasping how lipids are distributed and utilized in the body.

Exogenous vs. Endogenous Lipids

Exogenous lipids are those derived from dietary sources, primarily transported by chylomicrons, which are formed in the intestines after fat consumption. In contrast, endogenous lipids are produced by the liver and transported by lipoproteins such as low-density lipoprotein (LDL). This distinction is essential for understanding lipid metabolism and the implications for health and disease.

Chylomicrons and LDL

Chylomicrons are a type of lipoprotein that specifically transport dietary lipids from the intestines to other tissues, making them key players in the exogenous lipid transport pathway. Low-density lipoprotein (LDL), on the other hand, is primarily responsible for carrying cholesterol and other lipids from the liver to peripheral tissues, representing the endogenous lipid transport pathway. Recognizing the functions of these lipoproteins helps in understanding their roles in cardiovascular health.