Briefly describe the "abcs" of resuscitation.

A = Airway (Open the airway by tilting the head back)

B = Breathing (Keep an airtight seal in the persons airway and administer two breaths per round.)

C = Circulation ( Check for pulse and if it found continue the artificial circulation by continuing the process: breath, pulse check, breath, etc etc.)

Your answer is  d.)relationship between pressure and air volume and led to the understanding of how respiration works