Final answer:
Allowing complete chest wall recoil after each compression during CPR is true and essential for effective blood circulation.
Step-by-step explanation:
Allowing complete chest wall recoil after each compression during cardiopulmonary resuscitation (CPR) is true. This action is crucial because it ensures that the heart fills with enough blood between compressions, which allows for more effective circulation when the next compression is applied. The mechanics involved in respiration include the expansion of the chest wall and the recoil of the lungs due to their elasticity. As the intercostal muscles relax and the diaphragm moves upward during exhalation, the chest wall returns to its original position, and the increase in pressure helps to expel air from the lungs. Similarly, in CPR, after each compression, allowing the chest to return to its normal position ensures the process mimics natural breathing and circulation as closely as possible.