Question

Put the steps of muscle contraction into the correct order Troponin releases calcium and the actin...

Put the steps of muscle contraction into the correct order

Troponin releases calcium and the actin binding sites are covered by the twisting of tropomyosin

A stimulus from the nerve cell is brought down the T tubule

Calcium is released from the SR into the cytoplasm

Myosin binds to Actin

Calcium is removed from the cytoplasm and actively transported to the sarcoplasmic reticulum

tropomyosin untwists and exposes the actin binding sites

The thin filament slides closer to the M line, shortening the sarcomere

Calcium binds to troponin
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Answer

Steps of muscle contraction

  1. A stimulus from the nerve cell is brought down the T tubule
  2. Calcium is released from the SR into the cytoplasm
  3. Calcium binds to troponin
  4. Tropomyosin untwists and exposes the actin binding sites
  5. Myosin binds to Actin
  6. The thin filament slides closer to the M line, shortening the sarcomere
  7. Troponin releases calcium and the actin binding sites are covered by the twisting of tropomyosin
  8. Calcium is removed from the cytoplasm and actively transported to the sarcoplasmic reticulum
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