In the resting state of muscles, where is calcium stored?

Define the sliding filament theory of muscle contraction.

Provide the full names for the following abbreviations:
$(1)$ $HMM$
$(2)$ $ATP$

The backward bending of the shank is worked out by

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

Select the correct option for skeletal muscle.
$(I)$ In human body,it is made of a number of muscle bundles.
$(II)$ Muscle bundles contain a number of muscle fibers and each fiber is lined by the sarcolemma.
$(III)$ In a muscle fiber,the sarcoplasm contains only one nucleus.
$(IV)$ In a muscle fiber,the sarcoplasmic reticulum is the storehouse of calcium ions.