When muscles contract

When a muscle contracts suddenly and powerfully, it results in

When a muscle contracts suddenly and powerfully, it results in

Give the technical terms used for the following: All the muscles contract when they receive the stimulus of an adequate strength. The lowestr limit of stimulus capable to bring a contraction.

The ion useful in the muscle contraction is

Which are involved in muscle contraction?

Striated muscles contract becauses of

Which are involved in muscle contraction?