The document provides information on how to perform cardiopulmonary resuscitation (CPR). It discusses the anatomy of the heart and lungs. It then covers the key steps of adult basic life support, including checking for response, calling for help, checking for a pulse, providing rescue breaths or chest compressions, using an automated external defibrillator, and placing an unresponsive victim in the recovery position. The goals of CPR are to restore cardiopulmonary function and prevent brain damage from lack of oxygen.