The major protein in the thick filament of skeletal muscle fibre is

Sliding filament theory was given by

Which part of a muscle cell is the storehouse of calcium ions?

Which of the following muscles are not under the voluntary control of the nervous system?

What are $HMM$ and $LMM$?

$A$: 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.