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Why is the presence of chordae tendineae more critical for the atrioventricular valves (tricuspid and mitral)...

Why is the presence of chordae tendineae more critical for the atrioventricular valves (tricuspid and mitral) than the semilunar (aortic and pulmonary) valves?

Science   Anatomy-And-Physiology   
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The chodae tendinae are more critical for the atrioventricular valves than the semilunar valves as chordae tendinae plays a vital role in holding the atrioventricular valves in place while the heart is pumping blood.The relaxed chordae tendineae tense up to hold the cusps of the atrioventricular valves in place when they close. This prevents prolapsing of the valve leaflets and keeps blood from regurgitating into the upper atrial chambers (the left atrium and right atrium).

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