Which of the following does not happen during ventricular systole?
A. The conduction system carries the electrical impulses from the AV node to the Purkinje fibers, the ventricles depolarize and contract together.
B. Contraction of the ventricles decreases the volume and increases the pressure inside the ventricles.
C. Papillary muscles contract, pulling on the tendinous chords to ensure that the AV valves stay closed and do not swing open towards the atria.
D. All of these happen during ventricular systole.
Answer: D
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