What organ systems are used for walking?

Organ systems used while walking are the nervous system, skeletal system, respiratory system, and muscular system. The nervous system sends the signal from our brain to our muscles, which moves them. Skeletal system moves the bones, and of course the respiratory system is used to breathe. 

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Muscular, skeletal, cardiovascular, respiratory

1 is 5 1/4 and the rest I didnt really get, but I tried on 5 and I think it is 5x