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. The ending of the name as a suffix tells the type of compound or functional group present.
[TA] a slight constriction of the aorta immediately distal to the left subclavian artery at the point of attachment of the ductus arteriosus. Synonym(s): isthmus aortae [TA], isthmus of aorta. A constriction in the fetal aorta between the ductus arteriosus and the left subclavian artery.
The aortic valve (1) is one of four valves in the normal heart. It sits between the left ventricle (2) and the aorta (3). Heart valves are thin flaps of tissue anchored in a fibrous ring. The normal aortic valve has 3 leaflets (4) that open to allow blood to move forward and close to prevent backward blood flow.