During the power stroke phase of the cross-bridge cycle

The myosin head pivots toward the middle of the sarcomere and pulls the attached actin filament with it.

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The actin head pivots toward the middle of the sarcomere and pulls the attached myosin filament with it.

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Ca++ ions are removed from the sarcoplasm

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Crossbridges rotate so that the myosin filaments fold in half

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Solution

The correct option is B The actin head pivots toward the middle of the sarcomere and pulls the attached myosin filament with it.
The power stroke phase is the 2 step in the cross- bridge cycle
The binding of the myosin head to actin causes the release of ADP and inorganic phosphate. During this release, the energy contained in the high energy form is released as the myosin head pivots towards the middle of the sarcomeres and pulls the attached actin filament with it.

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Similar questions

What is the correct sequence of events in the cross bridge formation?

i. The power stroke

ii. Cross bridge formation

iii. Myosin head is activated by ATP

iv. Calcium released binds to the troponin unblocks the actin sites

v. Cross bridge detachment

vi. Reactivation of the myosin head

Arrange the changes during muscle activation as they happen

1. Calcium level increases.

2. Calcium level decreases.

3. Troponin and tropomyosin move to allow myosin to bind to actin.

4. The cross bridge cycle begins.

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