In striated muscle contraction:

$A$: Muscle tetanus is the phenomenon of sustained contraction of a muscle due to a succession of nerve impulses/stimuli being received by it.
$R$: Many of our daily activities are due to tetanic contraction of muscles,such as holding a book.

The muscles involved in the movement of the arm are

Given below are two statements:
$Statement-I$: Plasma creatinine is produced during catabolism of creatinine phosphate in skeletal muscle contraction.
$Statement-II$: Creatinine phosphate provides a ready source of high-energy phosphate.
In the light of the above two statements, choose the most appropriate answer from the options given below.

Who put forward the sliding filament theory?

Identify the characteristics of red muscle fibers from the following:
$I -$ Many mitochondria
$II -$ Use large amounts of $O_2$ for $ATP$ production
$III -$ Low amount of myoglobin
$IV -$ Less sarcoplasmic reticulum
Which of the above are characteristic of red muscle fibers?