When too much ldl cholesterol circulates in the blood, the excess amount can build up inside arteries. this buildup increases the risk of heart disease and stroke?

True, atherosclerosis is the chronic build up of atheromas (fatty plaques in vessel walls) which can rupture and lead to occlusion or obstruction downstream causing heart attack (blocking heart muscle) or stroke (blocking brain tissue).

Ibelieve this would be an obstacle.