what happens to muscle contraction after the nerve stops sending ACh?

1 Answer

  • Roland
    Lv 7
    1 decade ago
    Favorite Answer

    Once acetycholine molecules are no longer depolarizing the muscle cell membrane, that membrane REpolarizes, and so do the transverse tubules and the terminal cisterns inside the muscle cell. The calcium ions are then pumped out from among the actin and myosin filaments back into the terminal cisterns (part of the endoplasmic reticulum). Then the filaments - no longer able to attach to each other - slide apart, and the cell elongates. This is the relaxation of the muscle cell.

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