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How the arms move up and down?

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Anonymous

12y ago
Updated: 8/20/2019

Initially, Your brain sends motor information from the motor cortex to the ventral roots of the spinal column (ventral roots are topographically organized by what muscles they control). These neural projections end at the neuromuscular junctions that are in the arm. Once that information reaches the neuromuscular junction, depolarization of the muscle fiber occurs. Then the interaction between actin and myosin myofilaments causes your muscle fibres to contract or relax depending on whether you want to flex you arms or extend them.

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Wiki User

12y ago

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