Anonymous asked in Science & MathematicsBiology · 8 years ago

Which ion enters the cell, initiating an action potential when ACh binds to the muscle fiber?

3 Answers

  • Anonymous
    8 years ago
    Favorite Answer

    Well im guess that you taking your quiz for ZOOL 2404. you're answer is Na+

    Source(s): Im in the class
  • 8 years ago

    Sodium ions.

    Acetylcholine binds to its receptors at the muscle cell, which results in Sodium ions entering the cell. As sodium ions enter, they bring in a positive charge resulting in membrane depolarization. The membrane depolarization would lead to the Calcium release from the intracellular stores. Calcium elevation inside the cells results in muscle contraction.

  • 8 years ago

    Ca 2+

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