Final answer:
Atherosclerosis is the hardening of the arteries due to the buildup of plaques. It can lead to restricted blood flow and various health issues.
Step-by-step explanation:
The hardening of the arteries is called atherosclerosis. Atherosclerosis occurs when plaques made up of fat, cholesterol, calcium, and other substances build up in the walls of the arteries, making them narrower and less flexible. As a result, blood flow to organs and tissues may be reduced, leading to various health problems.
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