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Binding Occurs Excitation Stops Muscle Contraction Calcium Ions

When excitation ceases, calcium returns to the sarcoplasmic reticulum, tropomyosin re-blocks binding sites, and myosin detaches from actin.

When excitation stops, calcium ions are actively transported back into the sarcoplasmic reticulum, allowing tropomyosin to re-block the binding sites and detach the myosin heads from actin.

Front What occurs when excitation stops in muscle contraction
Back Calcium ions leave binding sites and are moved by active transport into sarcoplasmic reticulum
Tropomyosin move back so they block the actin-myosin binding site
no myosin head attached to actin filaments

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