The membrane sarcolemma is found over

In the center of each $I$-band is an elastic fiber called the $......$ which bisects it.

Stimulation of a muscle fiber by a motor neuron occurs at

In the resting state,a subunit of troponin masks the active binding sites for .......... on the .......... filaments.

Hypertrophy of muscle is

In the mechanism of muscle contraction or shortening of muscle,the . . . . . . get reduced whereas the . . . . . . retain the length.