$A$ human body contains how many muscles?

The monomeric protein which polymerises to form myosin is

The muscular contraction in which the tension remains the same and the mechanical work is also done is called

The total number of muscles in the human body is:

'Gastrocnemius' is a muscle of

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.