Final answer:
Heart murmurs associated with ventricular septal defects, mitral regurgitation, and tricuspid regurgitation arise from abnormal blood flow due to an opening or valve malfunction.
Step-by-step explanation:
The types of murmurs associated with ventricular septal defects, mitral regurgitation, and tricuspid regurgitation relate to the areas of the heart where these conditions occur. Ventricular septal defects create murmurs due to an abnormal opening in the interventricular septum, allowing blood to flow between the ventricles. Mitral and tricuspid regurgitations refer to conditions where the mitral and tricuspid valves, respectively, fail to close completely, causing blood to flow back into the atria from the ventricles.
Murmurs are classified by medical professionals using a grading scale from 1 to 6 based on the intensity of the sound produced by the turbulent flow of blood. The auscultation process, involving listening to the heart sounds with a stethoscope, initially detects these murmurs. Phonocardiograms or auscultograms can record the sounds for further analysis. Heart disorders such as tetralogy of Fallot may accompany ventricular septal defects, which is a serious heart condition that requires medical imaging for diagnosis and possible comprehensive surgical repair.