Which step of a muscle contraction can be described as the shortest sarcomere? ?

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Which step of a muscle contraction can be described as the shortest sarcomere? ?

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the answer is: the “power stroke” phase.

Muscle contraction can be divided into a few stages:

1. only release (acetylcholine) in the synaptic cleft, binding only to its receptor and thereby opening the ca channels.

2. release of ca, ca binding to the troponin

3. troponin transferring the tropomyosin, which was blocking the active site on the actin

4. Myosin attaches to actin by breaking down atp into adp + pi

5. the formation of the ‘cross-bridge’ at the active site of the actin filament with a myosin head

6. “power stroke” – the crossover draws actin, which slides over the myosin

9. 7. adp release completes the cross-bridge movement and attaches atp to myosin, breaking the actin-myosin cross-bridge.