It's important to note that a diamond's carat weight does not equal size. Because of differences in depth and cut, two diamonds with identical diameters may in fact be two completely different sizes. Therefore, it is possible to buy a diamond that looks bigger than another that may actually have a smaller carat weight. When buying a diamond, consider the length, width and depth of a stone as well as the surface of the diamond (the part that will actually show when the diamond is set).
The tunica adventitia is the outermost layer of the arteries and veins. The word 'adventitia' in tunica adventitia comes from the Latin 'adventicius,' which means 'coming from outside.' This strong outer layer is composed of connective tissue that allows the blood vessel to withstand forces acting on the vessel wall.ll arteries and veins contain three layers. The innermost layer is called the tunica intima. The muscular middle layer is called the tunica media, and the outermost layer is called the tunica adventitia.
The structure of the vessels have distinguishing features from arterial side to venous side (primarily muscle type or lack of muscle). The 5 different types of vessels have a different design of these 3 layers: 1) Tunica Interna (intima) - the inner lining of a blood vessel that is in contact with the blood. It's composed of simple squamous epithelium known as endothelium. There's also a basement membrane which is the vessels guide to repair, helps set-up for repair. The internal elastic lamina has window like openings that help allow things to diffuse out of the blood.