12 Key and Core Catalog With a mechanical key system, the level of security is determined by masterkey control. A masterkey system enables facilities of any size to manage the building by defining access by person and by area in increasing levels of complexity. Since BEST invented the standard for masterkey systems, there is no
When they occur in the upper part of the aorta, they are called thoracic aortic aneurysms. Aneurysms can occur anywhere in the thoracic aorta, including the ascending aorta near the heart, the aortic arch in the curve of the thoracic aorta and the descending aorta in the lower part of the thoracic aorta.
Confidence votes 206. A dilated aorta is an aorta that is wider than normal. This is indicative of an aortic aneurysm, or a bulging of the aorta due to a weakening in the walls of the aorta.Aortic aneurysms are dangerous because they can cause the walls of the aorta to tear--aortic dissection--or rupture completely, leading to severe internal bleeding. The aorta is the largest blood vessel in the body, originating from the left ventricle of the heart and bringing oxygenated blood to all parts of the body in the systemic circulation.