The simple answer is that snakes shed their skin because they are just like all other animals. All animals shed their skin â even you! In mammals, especially humans, this is an ongoing process that's rarely noticed. Skin shedding in reptiles is different. Instead of an ongoing process, reptiles shed skin periodically.
According to the International Liaison Committee on Resuscitation guidelines, CPR involves chest compressions at least 5 cm (2 in) deep and at a rate of at least 100 per minute in an effort to create artificial circulation by manually pumping blood through the heart and thus the body.
The 2010 CPR Update really put chest compressions front and center. Chest compressions should be at least 2 inches deep for adult patients and should be delivered at a rate between 100-120 per minute. Deliver chest compressions too slow and there will never be enough blood pressure to reach the brain adequately.