What term refers to the two normal heart sounds often described as a lub and a dub?

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Multiple Choice

What term refers to the two normal heart sounds often described as a lub and a dub?

Explanation:
Two normal heart sounds heard as lub and dub are the first and second heart sounds, known as S1 and S2. S1 marks the closure of the AV valves at the start of systole, producing the lub; S2 marks the closure of the semilunar valves at the end of systole, producing the dub. When referring to both sounds together, clinicians often write S1S2 or simply say the heart sounds S1 and S2. The other terms describe a rapid heart rate (tachycardia), an irregular rhythm (atrial fibrillation), or a vascular abnormality (aneurysm) and do not describe the normal heart sounds.

Two normal heart sounds heard as lub and dub are the first and second heart sounds, known as S1 and S2. S1 marks the closure of the AV valves at the start of systole, producing the lub; S2 marks the closure of the semilunar valves at the end of systole, producing the dub. When referring to both sounds together, clinicians often write S1S2 or simply say the heart sounds S1 and S2. The other terms describe a rapid heart rate (tachycardia), an irregular rhythm (atrial fibrillation), or a vascular abnormality (aneurysm) and do not describe the normal heart sounds.

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