Question

Which step of a muscle contraction can be described as the longest sarcomere, where actin and myosin are the least overlapped?

Answer 1

Answer:

During step one no impulse has occurred yet. Thus, the muscle fiber is relaxed (at rest). The sarcomere is at its longest possible length due do the fact that myosin is not bound to the actin.

This step will end when the brain or spinal cord will send an impulse to the muscle. This will travel through the motor neuron and reach the neuromuscular junction. Here acetylcholine will be released, which in turn will trigger the impulse in the muscle.

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Answer 2

During relaxation of the muscle the longest sarcomere can be seen as there is no overlap between the actin and myosin filaments.

Explanation:

• During contraction of the muscle there is overlapping between actinomycin filaments As a result there is shortening of the corresponding length of the sarcomere.
• Also due to the sliding theory of the actin and myosin which results in in the overlap between the actin filament and the myosin filament resulting in decrease in the total length.
• As a result whenever muscle contracts sarcomere become short.

To know more about the sliding filament theory of muscle,

Define the sliding filament theory of muscle

https://brainly.in/question/6074980