___are thick filaments.

___are regulatory proteins that cover the myosin binding site on the actin.

Calcium binds to ___of the troponin-tropomyosin complex.

Calcium is stored in the ___.

A ___extends from one Z disc to another Z disc.

___gets shorter during contraction.

___forms a crossbridge with actin.

___provides energy for muscle contraction and relaxation.

___slides inward during muscle contraction.