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

Question 15

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.

Correct Answer:

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