Completar frases 109-testVersión en línea 109-test por Farhad Key 1 way switch contract pulses pattern pattern spinal modes In animals , movement is coordinated by a cluster of neurons in the cord called the central generator ( CPG ) . This produces signals that drive muscles to rhythmically in a that produces running or walking , depending on the of . A simple signal from the brain instructs the CPG to between different , such as going from a standstill to walking .
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