Pulmonary semilunar valves are closed during $\qquad$ systole.

A) ventricular

B) atrial

C) continuous

D) discontinuous

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The correct answer is B) atrial.

During atrial systole, blood flows from the atria into the ventricles via the bicuspid and tricuspid valves. The pulmonary semilunar valves are closed during this phase to prevent the backflow of blood into the ventricles. The closure of these valves contributes to the second heart sound, known as the 'Dub' sound, which can be heard through a stethoscope placed on the chest.

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