A murmur that is heard after the 1st heart sound and before the 2nd heart sound and is most easily auscultated in the 1st intercostal space immediately to the right of the sternum would most likely be caused by a:

is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole or

the closing of the atrioventricular valves

Explanation:

Heart murmurs are noises or vibrations caused by turbulence in blood flow in the heart.

murmur that is heard after the 1st heart sound and before the 2nd heart sound and is most easily auscultated in the 1st intercostal space immediately to the right of the sternum is caused by the closing of the atrioventricular valves or is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole.

Systolic murmurs occur between the first heart sound (S1) and the second heart sound (S2). It is called the lub sound i.e the first sound.

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explanation:

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