Now, following the above steps: 1  The parent hydrocarbon chain has 23 carbons. It is called tricosa-. 2  The functional groups with the highest precedence are the two ketone groups. The groups are on carbon atoms 3 and 9. 3  The side chains are: an ethyl- at carbon 4, an ethyl- at carbon 8, and a butyl- at carbon 12.
1 doctor agreed: 1  AORTIC REGURGITATION: Aortic regurgitation is reflux of blood through an incompetent aortic valve into the left ventricle during ventricular diastole (relaxation). During ventricular systole (contraction), blood is pumped from the left ventricle into the aorta. Because of a leaky aortic valve, the pumped blood returns to the left ventricle.
The definition of regurgitation is simply fluid or material moving backwards; in the body, there are several examples of this. In the heart, regurgitation (known as aortic regurgitation or mitral regurgitation) means that a defect in the heart valves allows some blood to flow in reverse from the normal flow.n the heart, regurgitation (known as aortic regurgitation or mitral regurgitation) means that a defect in the heart valves allows some blood to flow in reverse from the normal flow.