@lesterholland The Vagus nerve is the regulator of the heart's rhythm when it has the correct 'tone', and when the Vagus nerve is not doing its job it's called 'dysautonomia.' As you would know, the body has to central nervous system response sets, the sympathetic (in sympathy with stress and threats, so 'fight-or-flight' with all the energy, heavy breathing, sweating before you exert yourself, and rapid heart rate due to epinephrine) and parasympathetic where you become calmed, relaxed, maybe sleepy. The Vagus nerve regulates the parasympathetic responses if you have no threats about you. So, if your Vagus nerve loses tone, it can cause the bowels to explosively evacuate, or one to void their bladder, essentially involuntarily. Believe it or not, it's a defense mechanism meant to distract or to deter a would-be threat to you, but also to literally lighten the load in case you have to flee to save yourself.
https://my.clevelandclinic.org/health/diseases/6004-dysautonomia