#sympathetic_nervous_system__sympatheticnervoussystem  originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels
  supertype:  nervous_system__nervoussystem__systema_nervosum__systemanervosum  the sensory and control apparatus consisting of a network of nerve cells
  part of:  autonomic_nervous_system
  part:  splanchnic_nerve  any of several nerves of the sympathetic part of the autonomic nervous system that innervate viscera and blood vessels
  part:  solar_plexus__coeliac_plexus__plexus_celiacus__abdominal_nerve_plexus  a large plexus of sympathetic nerves in the abdomen behind the stomach
  part:  alpha_receptor__alphareceptor__alpha-adrenergic_receptor__alpha-adrenoceptor__alphaadrenoceptor  receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal muscles and contraction of smooth muscles)
  part:  beta_receptor__beta-adrenergic_receptor__beta-adrenoceptor  receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasodilation and increased heart beat)

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