Of the events that lead to myofi laments sliding over each other, which of the following happens fi rst? A. The myosin head engages with the binding site on actin B. Troponin changes shape and pulls on tropomyosin C. Calcium ions enter the cell cytoplasm D. ATP is hydrolysed to ADP and inorganic phosphate
Option C. Ca have to fi rst input the cytoplasm which will bind with troponin. Once the binding cite is exposed, the myosin head can also additionally have interaction the binding site. Prior to engagement, ATP need to be hydrolysed to ADP.
