Question

Which heart valves are not actively closed by the contraction of muscular structures?

Answer 1

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The mitral and tricuspid valves ae both atrioventricular valves. Semilunar valves are not associated with the papillary muscles, and are not actively closed.

Answer 2

The first heart sound, "Lub," indicates that the heart has entered systole.

Systole is typically defined as ventricular contraction.

As the ventricles contract, the AV valves close to prevent regurgitation into the atria.

The first heart sound indicates the closure of the

Both are closed.