This is essentially the point at which the system resets and returns (very briefly) to its resting state in order to start the next heartbeat cycle. The heart's electrical conduction system has distinct phases, the last of which is called ventricular depolarization. John Greenwood, an assistant professor at the the University of Pennsylvania's Perelman School of Medicine, told Business Insider that the forceful, direct impact of an object can cause the heart to stop if it hits a person's chest at a specific time in their heartbeat cycle. This type of hit would cause a severe injury, but it would only cause cardiac arrest in very rare cases. "It's basically a gas rocket bullet." A shock to the heart's electrical conduction systemĪllain couldn't say exactly how fast a cartridge might fly, but guessed it could be more than 30 mph. "A cartridge by itself would go even faster," Allain said.
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