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Nerve cells called motor neurons control the skeletal muscles. Each motor neuron controls several muscle cells in a group known as a motor unit. When a motor neuron receives a signal from the brain, it stimulates all of the muscles cells in its motor unit at the same time.
Motor neurons then carry the command to the muscle fibers. Each motor neuron controls the contraction of a specific group of fibers. The more motor neurons that are activated, the greater the quantity of muscle fibers that will contract. This is why training should be done with heavy weights.