Chordae tendinae regulate the opening and closing of a) Spiral valve b) Eustachian valves c) Thebesian valve d) Cuspid valves
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The answer is d)cuspid valves
Chordae tendinae are present in heart.Chordae tendinae are the muscular attachments present beneath the cuspid valves which helps in opening and closing of the cuspid valves(Tricuspid valves and bicuspid valves).
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