What is the role of calcium ions in muscle contraction ?

Which neurotransmitter causes depolarization of muscle fibre? What is the role of calcium in muscle contraction ? Why is there need of a refractory period?

What is role of calcium in muscle contraction?

The role of calcium in muscle contraction is :

Role of calcium in muscle contraction is ……….

State the role of calcium ions in contraction and relaxation of muscles.

What is the role of Ca^(++) in muscle contraction?