The greater the effective nuclear charge the more tightly an electron is held in by the nucleus because there is less electron shield between the valence electrons and the nucleus, and so, the smaller the radius.

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#XL - Q Biochemistry

Sarcomere

Within each skeletal muscle cell are many myofibrils consisting of a repeating array of a specialized structure

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#XL - Q Biochemistry

When the Ca2+ levels drop:

Myosin LC is dephosphorylated by MLC phosphatase, causing muscle relaxation.

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Phosphorylation of MLC 

unfolds the myosin II, active and can assemble into bipolar filaments for contraction

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The CaM*-Ca2+ complex binds and activates MLC kinase, phosphorylates the myosin LC. 

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When the Ca2+ level rises, Ca2+ binds CaM.

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#XL - Q Biochemistry

In vertebrate smooth muscle, phosphorylation of the myosin regulatory light chain activates contraction in Ca2+ dependent manner.