The plasma membrane of the muscle fibre is called

Which of the following proteins are responsible for movement?

Globular head with a short arm and a tail are the two important parts of

The functional unit of contraction is a

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.

Select the correct option for the following processes in muscle contraction:
Cross-bridge formation $\quad$ Cross-bridge breaking