In a muscle fiber,$Ca^{++}$ is stored in the .....

In which condition does relaxation occur in muscles?

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

Provide the full names for the following structures found in muscle fibers:
$(1)$ $Z-$ disc
$(2)$ $H-$ zone

How does a muscle shorten during its contraction and return to its original form during relaxation?

$A$: 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.