Final answer:
START triage assesses respiration, perfusion, and mental status to determine the urgency of medical attention required for victims in a mass casualty incident.
Step-by-step explanation:
The three physiological parameters assessed according to START triage are respiration rate, perfusion, and mental status. START stands for Simple Triage and Rapid Treatment and is a method used by first responders to quickly classify victims during a mass casualty incident based on the severity of their injuries. The process includes assessing whether the victim can walk, determining their respiratory effort (if they're breathing and the rate), evaluating their perfusion (capillary refill test or presence of a radial pulse), and checking their mental status (ability to follow simple commands). These parameters help in prioritizing who needs immediate medical attention in an emergency situation.