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The heart sound 'Dub' is produced when ______.
Biology
The Circulatory System
Question
Updated
19 Aug 2026
The heart sound 'Dub' is produced when ______.
A
Choose Your Answer
A
Semilunar valves open
B
Atria ventricular valves close
C
Semilunar valves close
D
Atria ventricular valves open
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