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The sarcoplasmic reticulum surrounds each sarcomere and pumps calcium. This calcium


produces muscle relaxation.

triggers muscle contraction.

provides fuel for the movement of myosin.

keeps the myosin heads from attaching to the actin strand.

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Histrionicusidn

The sarcoplasmic reticulum surrounds each sarcomere and pumps calcium. This calcium - triggers muscle contraction.

The sarcoplasmic reticulum

  • is a complex network of the specialized smooth endoplasmic reticulum.
  • important in transmitting the electrical impulse as well as in the storage of calcium ions.
  • surrounds each sarcomere or the myocytes
  • When the action potential propagates down the t-tubule, the voltage-sensitive proteins are activated
  • which triggers the release of calcium ions (Ca++) from the sarcoplasmic reticulum.
  • The Ca++ then initiates contraction, which is sustained by ATP

thus, The sarcoplasmic reticulum surrounds each sarcomere and pumps calcium. This calcium - triggers muscle contraction.

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