[单选题]
Which statement(s) are true fo m(g9wya-r mv.r ATqk4+c2lq .wy);*eogf 2 zurzrP hydrolysis during muscle contraction?
I. ATP is hydrolysed by the sarcoplasmic reticulum
II. ATP hydrolysis causes myosin heads to move into the ready position
III. ATP hydrolysis causes the cross-bridges to break