World's longest, largest, busiest highways. The United States has the largest national highway system. Click NEXT to read more... Image: An aerial photograph shows traffic on the southern portion of the 18-Mile Stretch, a facet of U.S. Highway 1 that connects South Florida with the Florida Keys in Key Largo, Florida. Photographs: Andy Newman/Reuters. World's longest, largest, busiest highways. China's highway network is the second most extensive in the world, with a total length of about 3.573 million km.
Aortic valve calcification is a condition in which calcium deposits form on the aortic valve in the heart. These deposits can cause narrowing at the opening of the aortic valve.This narrowing can become severe enough to reduce blood flow through the aortic valve, a condition called aortic valve stenosis.ortic valve calcification may be an early sign that you have heart disease, even if you don't have any other heart disease symptoms. Calcification and stenosis generally affect people older than age 65. When it occurs in younger people, it's often caused by:
Vascular Calcification. Vascular calcification refers to accumulation of calcium in the vascular structures. Given below is some information on the risks associated with the accumulation of calcium in the blood vessels.he blood vessels are tubular vascular structures that are categorized into arteries, veins and capillaries. While the arteries carry the oxygen-rich blood from the heart to the other parts of the body, the veins mainly carry the deoxygenated blood to the heart.