MediumZoologyBody fluid and circulation
+4 / -1
The second heart sound (dub) is associated with:
A
Closure of semilunar valves
B
Opening of AV valves
C
Closure of AV valves
D
Opening of semilunar valves
Explanation
The "dub" sound occurs during ventricular diastole when the semilunar valves close to prevent blood from flowing back from the arteries into the ventricles.
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The first heart sound (lub) is associated with:
NextIn a standard ECG, the P-wave represents:
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