Which of the following sequences correctly lists the components of CPR?

• A. Circulation, airway, breathing
• B. Airway, breathing, circulation
• C. Airway, circulation, breathing
• D. Breathing, airway, circulation

Answer: (B)

Airway, Breathing, Circulation is the order you follow in CPR. Start by making sure the airway is open so breaths can reach the lungs; if the airway is blocked, clear it. Once the airway is ready, provide rescue breaths to oxygenate the lungs. After ventilation is set, focus on circulating blood by chest compressions to move that oxygenated blood to the brain and other vital organs. This sequence ensures ventilation can be effective and that the oxygen reaching the lungs is actually delivered to the body's tissues through circulation. (Note: in some modern guidelines for adults, the emphasis can shift toward starting chest compressions promptly, but the ABC order is the standard taught in many CPR trainings.)