During CPR, how effective are chest compressions in circulating blood compared to the normal heart function?

Chest compressions during CPR are designed to mimic some aspects of normal heart function, specifically to generate blood flow throughout the body. When performed correctly, chest compressions can achieve a blood circulation rate that is approximately one-third of the normal flow generated by a functioning heart. This reduced effectiveness is due to several factors, including the mechanics of compression and the inability to provide the same pressure and filling that the heart naturally produces.

Given this understanding, it is crucial to recognize that while chest compressions are not as effective as a healthy heart in circulating blood, they are still vital during cardiac arrest. They serve to maintain some degree of blood flow to vital organs, which can help sustain life until further medical assistance, such as defibrillation or advanced life support, can be provided. The other options do not accurately capture the physiological reality of how CPR compressions support circulation during cardiac events.