Muscle Contraction

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Questions and Answers

Which molecule is responsible for exposing the myosin binding sites on actin during muscle contraction?

  • ATP
  • ADP
  • Calcium (correct)
  • Pi

What happens to the myosin head during the power stroke?

  • It hydrolyzes ATP
  • It pivots and pulls the thin filament (correct)
  • It binds to actin
  • It detaches from actin

What provides the energy to return the myosin head back to its resting configuration and restart the cross-bridge cycle?

  • ATP (correct)
  • Tropomyosin
  • ADP + Pi
  • Calcium

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