The structures, properties, and chemical reactions of organic and biochemicals are determined by the functional groups present. Functional groups are defined as specific groupings of atoms or bonds which are part of a larger hydrocarbon chain. It is necessary that you are able to recognize these groups by structure and by name. Functional Group Names: The ending of the name as a suffix tells the type of compound or functional group present.
1 Aortic dissection occurs when a tear occurs in the inner muscle wall lining of the aorta, allowing blood to split apart the muscle layers of the aortic wall.  Symptoms of aortic dissection include a tearing or ripping pain in the chest, sweating, nausea, shortness of breath, weakness, or syncope (fainting). Abdominal aortic dissection can present with abdominal pain radiating to the flank or back.
Aortic dissections are divided into two groups, depending on which part of the aorta is affected: Type A. This more common and dangerous type involves a tear in the part of the aorta where it exits the heart or a tear in the upper aorta (ascending aorta), which may extend into the abdomen. Type B. This involves a tear in the lower aorta only (descending aorta), which may also extend into the abdomen.