The store house of calcium ions in the muscle fibre is
a)	Smooth endoplasmic reticulum	b)	Golgi body
c)	Sarcoplasmic reticulum	d)	Lysosomes

(c)

Sarcoplasmic reticulum.

Each muscle fibre is lined by the plasma membrane called sarcolemma enclosing the sarcoplasm. Muscle fibre is a syncitium as the sarcoplasm contains many nuclei. The endoplasmic reticulum, i.e., sarcoplasmic reticulum of the muscle fibres is the store house of calcium ions. A characteristic feature of muscle fibre is the presence of large number of parallely arranged filaments in the sarcoplasm called myofilaments or myofibrils