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garri49 [273]
3 years ago
15

How is contraction of a skeletal muscle fiber brought about

Biology
2 answers:
alina1380 [7]3 years ago
5 0
When an impulse reaches the muscle fibres of a motor unit, it stimulates a reaction in each sarcomere between the actin and myosin filaments. This reaction results in the start of a contraction and the sliding filament theory.
lubasha [3.4K]3 years ago
4 0

Answer:

When an impulse reaches the muscle fibres of a motor unit, it stimulates a reaction in each sarcomere between the actin and myosin filaments. This reaction results in the start of a contraction and the sliding filament theory.

Hope this helps! :)

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