The thread like tendons of papillary muscles, inserted upon the flaps of tricuspid and bicuspid valves are

Chordae tendinae

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Yellow ealstin fibres

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Reticulate fibres

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Collagen fibres

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Solution

The correct option is C Chordae tendinae
The chordae tendinae are tendinous structures, which prevents the valves of heart from movement by holding the flaps tightly against the strong flow of blood. It allows the blood to flow in one direction only.
So, the correct answer is option A.

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