Globular head with a short arm and a tail are the two important parts of

Which is the smallest muscle in the human body?

The storehouse of calcium ions in the muscle fibre is

Which of the following proteins are responsible for movement?

$A$: Application of stimuli repeatedly just at the start of relaxation of a muscle fibre shows an increase in the extent of contraction initially and results in treppe or staircase phenomenon.
$R$: It can be attributed to the summation effect of the sub-threshold stimuli being given again and again.

The biceps and triceps muscles are found in