Science Illustrated

Blood vessels clog

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1The blood carries bad cholestero­l to the blood vessels of the heart, where it settles on the vascular walls.

2White blood cells find their way to the cholestero­l’s hiding place and convert it into foam cells.

3When foam cells accumulate over many years, they produce fat deposits in blood vessel walls.

4The fat can accumulate over several years in many blood vessels, so they will slowly become narrower, and a blood clot could easily get stuck in the narrow passage.

5When a blood vessel is blocked by a blood clot or a thick wall of foam cells, the blood cannot pass.

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