<prompt> Which of the following is responsible for skeletal muscle relaxation?DystrophinTropomyosinMyosinActin  <response>: Ans. B TropomyosinRef: Gattong, 25th ed. pg. 101 Tropomyosin acts as a relaxing protein at rest by covering the sites where myosin binds to action Dystrophin is a sarcolemmal protein providing calcium input to sarcoplasmic reticulum. This Ca is useful in coupling of actin-myosin complex. 