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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