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