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Which one of the following statements is...

Which one of the following statements is correct?

A

the atrio-ventricular node (AVN) generates an action potential to stimulate atrial contraction

B

the tricuspid and the bicuspid valves open due to the pressure exerted by the simultaneous contraction of the atria

C

blood moves freely from atrium to the ventricle during joint diastole

D

increased ventricular pressure causes closing of the semilunar valves

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