In a self-diagnosis situation, self-monitoring can help you determine any symptoms or behaviors, so you can pass them on to a doctor. Many have no real idea of what their behaviors or triggers are. Self-monitoring can help you gather that information first before meeting with a professional.
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The nervous system in one's body sends signals to the muscles to contract in order to move or perform a task like walking. The respiratory system sends oxygen to the muscles in order to provide energy for those actions