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An anaesthesist friend of mine once told me that there are two kinds of muscles - the ones you can actively control (such as muscles in arms and legs and also the muscles for breathing) and those you cannot, such as your heart and intestine-muscles (around the gut etc.). The latter has a different kind of receptors and isn’t affected by the stuff that they use in hospitals to put you down, but since the breathing is stopped, you’ll always be intubated.
I guess this poison is of the same kind but I don’t know the technicalities…
To explain it in simple terms, your heart doesn't get its beating signal from the brain, the sinus node takes care of that and is located in the heart. What the brain (and other parts of your body) does is tell the heart to beat faster or slower when required. So the kind of paralysis caused by the octopus doesn't affect your heart because it doesn't need to use any external pathways to send the signal to the muscle to contract.