What Is the Correct Sequence of Events in Cross-Bridge Cycling

question 25

Multiple Choice

What is the correct sequence of events in cross-bridge cycling?

• A)Myosin cross-bridge binds to actin,the powerstroke moves the thin filament relative to the thick filament,ATP binds to myosin and cross-bridge detachment occurs,ATP is hydrolyzed and the myosin head is "cocked"
• B)The powerstroke moves the thin filament relative to the thick filament,myosin cross-bridge binds to actin,ATP binds to myosin and cross-bridge detachment occurs,ATP is hydrolyzed and the myosin head is "cocked"
• C)Myosin cross-bridge binds to actin,ATP is hydrolyzed and the myosin head is "cocked," the powerstroke moves the thin filament relative to the thick filament,ATP binds to myosin and cross-bridge detachment occurs
• D)Myosin cross-bridge binds to actin,ATP binds to myosin and cross-bridge detachment occurs,the powerstroke moves the thin filament relative to the thick filament,ATP is hydrolyzed and the myosin head is "cocked"
• E)These events can occur in any sequence without affecting muscle function.

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