Final answer:
Cardiac arrest is true when the heart stops pumping blood effectively, and it is a dire emergency that requires prompt medical intervention including the use of an AED or CPR.
Step-by-step explanation:
True, cardiac arrest occurs when the heart stops pumping blood or pumps blood so inadequately that essential organs fail to function properly. This is a critical medical emergency that requires immediate intervention. An automated external defibrillator (AED) can deliver a life-saving electrical shock to the heart, attempting to restore a normal heartbeat. Cardiopulmonary resuscitation (CPR) is another vital technique used in such emergencies, where manual chest compressions help circulate blood to vital organs, especially the brain, to prevent irreversible damage until normal heart function can be reestablished.