The papillary muscles contract after the other ventricular muscles so that they can take up the slack on the chordae tendineae before the full force of ventricular contractions sends blood against the atrioventricular (AV) valve flaps.

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The papillary muscles contract at the same time as the other ventricular muscles to prevent the atrioventricular (AV) valves from inverting by taking up slack on the chordae tendineae as the ventricles contract, ensuring the valves close properly and blood is pumped efficiently.

The Papillary Muscles Contract After the Other Ventricular Muscles So