Respuesta :
All of the sarcomeres in the fiber contract when a muscle fiber receives an action potential from a neuron
A skeletal muscle fibre contracts in response to a motor neuron signal as the thin filaments within its sarcomeres are tugged and then move past the larger filaments. The sliding filament model of muscle contraction describes this procedure. The Z lines get closer together and the I band gets smaller when a sarcomere compresses.
At maximum contraction, the thin filaments overlap and the A band maintains its original width. Sarcomeres' constituent thick and thin filaments, however, do not shorten. Instead, they go past one another, shortening the sarcomere while keeping the filaments at their original length.
Learn more about sarcomere here;
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