<prompt> In the diagram depicting force velocity relationship of skeletal muscle, the difference between the three curves is mainly due to?Frequency of muscle contractionMuscle massHypertrophyMyosin ATPase activity  <response>: Ans. d Myosin ATPase activityRef: Guyton 13th ed p.81Simply remember, velocity of contraction is maximum when there is no load weight to be lifted at all and it decreases whenever the load weight increasesThe maximum velocity of shortening depends on myosin ATPase activity of the muscle which is the sole reason behind the difference in these three curves 