The muscles immune to fatigue are

Contractile tissues have the following features:
$(i)$ Mesodermal in origin
$(ii)$ They contain stretch receptors
$(iii)$ Rhythmic contractions are seen in them
$(iv)$ They do not fatigue during the life of the animal
Which of the above are characteristics of sphincters?

Give the name of the subunits of Troponin.

Which one of the following types of muscle fibers will be the first one to undergo fatigue?

$A$ motor unit is also known as:

When there is a drop in the force of contraction after prolonged stimulation,it is known as