Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Neuromuscular Disorders ?
    ### Response:
    Neuromuscular disorders affect the nerves that control your voluntary muscles. Voluntary muscles are the ones you can control, like in your arms and legs. Your nerve cells, also called neurons, send the messages that control these muscles. When the neurons become unhealthy or die, communication between your nervous system and muscles breaks down.
    