Final answer:
The papillary muscles in the heart contract to cause the tricuspid and bicuspid valves to open.
Step-by-step explanation:
The papillary muscles in the heart contract in such a manner to cause the tricuspid and bicuspid valves to open.
During the relaxation phase of the cardiac cycle, the papillary muscles are relaxed, but as the ventricles contract, so do the papillary muscles. This creates tension on the chordae tendineae, helping to hold the cusps of the valves in place and preventing them from being blown back into the atria.
Therefore, the statement is true.