Is there something in their brain that gets overloaded or something?
In: Biology
It’s actually the opposite.
Your sympathetic system is this “fight or flight response”, which increases your blood pressure when you are very shocked or scared.
After the scare has passed, your parasympathetic nervous system tries to calm the body down by lowering the blood pressure.
However, when blood pressure changes too quickly (BP drops), not enough oxygen is delivered to the brain quickly enough and it starts to shut down.
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