Artery
One type of arteriosclerosis is atherosclerosis.  Atherosclerosis is a disease where the arteries get narrower because they are clogged up with things like cholesterol and fat.  Like a clog in sink pipes makes it harder for water to get through the pipes, clogs in arteries make it more difficult for blood to get through.  This makes the heart have to work harder to push blood through the arteries.  Atherosclerosis is a big risk factor for high blood pressure and heart disease.