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Of the events that lead to myofi laments sliding over each other, which of the following happens first

saraalalwane
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2022-09-20
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Of the events that lead to myofi laments sliding over each other, which of the following happens first?

  1. The myosin head engages with the binding site on actin
  2. Troponin changes shape and pulls on tropomyosin
  3. Calcium ions enter the cell cytoplasm
  4. ATP is hydrolysed to ADP and inorganic phosphate
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saraalalwane
2022-09-20
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C: Ca must fi rst enter the cytoplasm in order to bind with troponin. Once the binding site is exposed, the myosin head may engage the site. Prior to engagement, ATP must be hydrolysed to ADP.

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