In a muscle undergoes rapid contraction and relaxation, the sarcoplasmic reticulum extension

Options

A. requires constant plugging in and out of `Ca^^(2+)`
B. rapidly synthesise myosin
C. does not require energy
D. all of these

Answer

A

Explanation

Sacoplasmic reticulum of muscle cells store `Ca^(2+)` ions. During contracting of muscle, `Ca^(2+)` ions are released from sarcolasmic reticulum to sarcoplasm and vice versa occurs during relaxation it requires constant plugging in and out of `Ca^(2+)` ions from sarcoplasmic reticulum.