Which heart sound is associated with the closure of the aortic and pulmonic valves and has two components (aortic closure first, then pulmonic closure)?

Study for the Basic Arrhythmias With 12 Lead EKG's Test. Use our flashcards and multiple choice questions with hints and explanations. Get exam-ready!

Multiple Choice

Which heart sound is associated with the closure of the aortic and pulmonic valves and has two components (aortic closure first, then pulmonic closure)?

This is about the second heart sound. S2 is produced when the semilunar valves, the aortic and the pulmonic, close at the end of systole. It has two audible components: A2 from the aortic valve closing first, then P2 from the pulmonic valve closing. In a normal heartbeat, A2 occurs slightly before P2, which is why you can hear a split S2, especially on inspiration when the split becomes more pronounced. S2 is often described as the “dub” in the classic “lub-dub.”

By contrast, S1 comes from the closure of the AV valves (mitral and tricuspid) and marks the start of systole; S3 and S4 are extra heart sounds associated with rapid ventricular filling and atrial contraction, respectively.

Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy