Muscle Contraction

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Muscle Contraction is Triggered by an Influx of Calcium Ions:

  • Action-potential from a motor neurone stimulates a muscle cell.
  • Depolarisation of the sacrolema occurs.
  • This depolarisation spreads down the T-tubules to the sacroplasmic reticulum.
  • Sacroplasmic reticulum releases stored Ca2+ into the sacroplasm.
  • Ca2+ bind to the troponin, causing it to change shape.
  • The attached tropomysin is pulled away from the actin-myosin binding site on the


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