Name the connective tissue sheath which surrounds the muscle bundles.

Which of the following statements correctly describes the type of muscle present in the specified body part?

Which of the following statements is correct regarding muscle contraction?

Explain the sliding filament theory of muscle contraction with neat sketches.

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.

In the given diagram,which label represents the $I$-band?