Unstriped muscles are found in

Which of the following ions is necessary for the contraction of muscles and nerve impulse transmission?

What do ligaments connect?

What is the full form of the following terms used in muscle structure?
$(1)$ $A$-disc
$(2)$ $I$-disc

When there is a drop in the force of contraction after prolonged stimulation,it is known as

Which of the following statements are false regarding the muscle structure?
$I.$ In the centre of each $I$-band is an elastic fibre ($Z$-line) which bisects it.
$II.$ Thin filaments are firmly attached to the $Z$-line.
$III.$ $M$-line is a fibrous membrane in the middle of $A$-band.
$IV.$ $A$ sarcomere comprises one full $A$-band and two half $I$-bands.