$I-$bands of myofibrils are bisected by

Select the true statement.

In a skeletal muscle fibre,the nuclei are located:

Choose the correct option for the following:
Biceps $\quad$ Iris $\quad$ Heart

The dark bands ($A$-bands) of a skeletal muscle are known as

Analogy type questions:
$(1)$ The portion between two successive $Z$-lines is the functional unit of contraction,which is called the sarcoplasmic reticulum / sarcomere.
$(2)$ The thick filaments in the $A$-band are held together in the middle of this band by a thin fibrous membrane. It is called the $Z$-line / $M$-line.