Unstriped smooth muscles are found in

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

Select the correct option for the following statements:
$(i)$ The most important respiratory organ in frogs is the skin / lungs.
(ii) Skeletal muscle / Cardiac muscle exhibits rhythmic contraction.

Which of the following statements is correct regarding muscle contraction?

Which of the following muscles act involuntarily?
$(a)$ Striated muscles $(b)$ Smooth muscles
$(c)$ Cardiac muscles $(d)$ Skeletal muscles

Differentiate between striated muscle fibers and visceral muscle fibers.