In familial hypercholesterolemia, how are LDL levels typically affected?

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Prepare for the PLTW Biomedical Science Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

Multiple Choice

In familial hypercholesterolemia, how are LDL levels typically affected?

Explanation:
In familial hypercholesterolemia, LDL levels are elevated. This happens because mutations often impair the LDL receptor that liver cells use to remove LDL from the blood. With defective or insufficient receptors, LDL isn’t cleared efficiently, so it builds up in circulation. This leads to very high LDL cholesterol levels even if dietary intake is normal, and it increases the risk of early atherosclerosis. The other patterns—decreased, normal, or low-LDL levels—don't fit the condition because the core problem is reduced clearance, not increased removal or normal variation.

In familial hypercholesterolemia, LDL levels are elevated. This happens because mutations often impair the LDL receptor that liver cells use to remove LDL from the blood. With defective or insufficient receptors, LDL isn’t cleared efficiently, so it builds up in circulation. This leads to very high LDL cholesterol levels even if dietary intake is normal, and it increases the risk of early atherosclerosis. The other patterns—decreased, normal, or low-LDL levels—don't fit the condition because the core problem is reduced clearance, not increased removal or normal variation.

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