Question

What is a murmur called when it occurs between the first and the second heart sounds?

1) SA murmur
2) diastolic murmur
3) ventricular murmur
4) atrial murmur
5) systolic murmur

Answer 1

A murmur heard between the first heart sound (S1) and the second heart sound (S2) is known as a systolic murmur, associated with the ventricular systole.

Step-by-step explanation:

A murmur that occurs between the first and second heart sounds is called a systolic murmur. The first heart sound, S1, is associated with the closure of the atrioventricular valves and marks the beginning of ventricular systole(contraction). The second sound, S2, corresponds with the closing of the semilunar valves and the onset of ventricular diastole(relaxation). Therefore, a murmur heard after S1 and before S2 is a result of turbulent blood flow during the systole phase of the ventricles, hence a systolic murmur.