This sounds very obvious, I know. I assume it doesn’t immediately stop the heart, and people can still survive even while being “brain dead”. So what exactly happens in the body to cause immediate death once a bullet enters the brain?
In: Biology
If a bullet penetrate the skull, the hydraulic shock from headshot alone can severely damage the brain stem. And since the brain stem directly control breathing, the heart will quickly run out of oxygen and stop beating.
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