Question

Part B-Steps in a Cross Bridge Cycle The sarcomere shortens when the myosin heads of the thick flaments, in a cocked position, form cross bridges with the actin molecules in thin filaments. This activity will test your understanding of the steps that oocur in one complete cross bridge cycle. Place the steps that occur during a single cross bridge cycle in the correct order from left to right. View Available Hint(s) Reset Help ATP is hydrolyzed to ADP and P and the energy released re-cocks the myosin head The actiated myosin head binds to actin forming a cross bridge ADP is released and mycsin sices the thin flament toward the center of the saroomene ATP binds to the mycsin head and detaches it fromm actin Cvcle repeats ATP hvdrolvsis activates the mvosin head Reflect in ePortfolio Activity Details You have viewed this topic

Answer 1

From left to right the sequence to complete cross bridge is as follow:

1.ATP is hydrolyzed to ADP and Pi and the energy released re cocks the myosi head.

2. ADP is released and myosin slices the thin filament toward the center of the sarcomere.

3. The activated myosin head bridges to actin, forming a cross bridge.

4. ATP binds to the myosin head and detaches it from actin.