The document provides an overview of the emergency medical services (EMS) system and the roles within it. It discusses the timeline of EMS developing from Civil War medical care, the different models of EMS systems, and levels of training including emergency medical responders. Emergency medical responders are the first to arrive on scene and provide initial care like assessing the patient, providing basic life support, and safely moving the patient. Research and new technology help improve patient care standards and guidelines within the EMS system.