It does this by influencing the sympathetic and parasympathetic nervous systems via the vagus nerve. Some typical actions of the sympathetic and parasympathetic nervous systems are listed below. This is due to overactivation of the sympathetic nervous system. Catecholamine release is stimulated by the activation of the sympathetic nervous system. It is also influenced by central factors through sympathetic and parasympathetic nerves. Their performances are more dramatically bombastic than sympathetic, or sometimes even believable. A somewhat ungracious and not sufficiently sympathetic person. Broly is portrayed as a more sympathetic character. The insula controls autonomic functions through the regulation of the sympathetic and parasympathetic systems. She is one of the few Enlightened Ones sympathetic towards the Earthbound Ones. The vagal and sympathetic activity constantly interact. Familial dysautonomia is a genetic disorder characterized by abnormalities of sensory and sympathetic neurons. However, massive releases of these hormones coupled with sympathetic stimulation may actually lead to arrhythmias. Very few parts of the sympathetic system use cholinergic receptors. NGF is critical for the survival and maintenance of sympathetic and sensory neurons.