At various levels and locations in the brain, various things happen. Your volitional actions start at the top of the brain in the cortex and recruit any other part of the brain needed in order to initiate and complete that action. If it starts in the lower levels it can affect the things we do automatically (breathe, swallow, blink, regulate the insides of our bodies, etc.). It’s very complex depending on where it starts, how quickly it progresses, etc. Basically, it slowly shuts down all your major functions because your brain is now not able to do that or can only do it poorly.
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