<prompt> Which of the following statements is true regarding vocal cords?Two muscles adduct close the vocal cordsOne muscle abducts opens the vocal cordsOne muscle adjusts the length of the vocal cordsOne muscle adjusts the tension of the vocal cords  <response>: b One muscle abducts opens the vocal cordsRef. Scott Brown, 8th ed., Vol 3; 889All muscles of VC are adductorsThe tensors alter the length, hence tension of vocal cords. There are two tensors of VC. 