A CPR training mannequin includes a humanoid torso, the torso composed of a material having a degree of transparency. A humanoid head is connected to the torso and has a mouth opening connected to a ventilation tube within the head. The torso is supported by resilient elements from the base to simulate resistance to chest compressions. A simulated heart and simulated lungs are arranged within the torso and are visible through the front surface of the torso. Sensors measure the air flow during CPR ventilation and depth of CPR chest compressions. Lights within the heart, brain and lungs indicate the chest compressions and ventilation are adequate to resuscitate the simulated victim.