As a responder, you are a key part of the pre-hospital care system, also known as the emergency medical system. The pre-hospital care system is a network of professional responders with an integrated approach to providing care in an emergency situation. Your level of expertise may provide a link between the first actions of bystanders and more advanced medical care. A professional responder is a person who, in a paid or volunteer capacity, is often summoned to provide initial care during an emergency. As the first trained professional on the scene, you perform critical actions and may have a significant effect on the patient’s outcome.