The first heart sound (S1) is caused by _____________. Posted byAnonymous August 15, 2024 Questions The first heаrt sоund (S1) is cаused by _____________. Show Answer Hide Answer Tags: Accounting, Basic, qmb, Post navigation Previous Post Previous post: The rationale for clinical use of a tourniquet in surgery is…Next Post Next post: A rumbling murmur is heard when a valve is stenotic.