title: Sympathetic mechanisms in blood vessels: nerve and muscle relationships.
mesh_terms: D000200:Action Potentials; D000818:Animals; D001808:Blood Vessels / Q000502:physiology*; D004058:Diffusion; D004431:Ear, External / Q000098:blood supply; D066298:In Vitro Techniques; D009130:Muscle, Smooth / Q000294:innervation; D009132:Muscles / Q000502:physiology*; D009469:Neuromuscular Junction; D009474:Neurons / Q000378:metabolism / Q000502:physiology*; D009638:Norepinephrine / Q000378:metabolism; D011169:Portal Vein / Q000502:physiology; D011651:Pulmonary Artery / Q000502:physiology; D011817:Rabbits; D051381:Rats; D013564:Sympathetic Nervous System / Q000502:physiology*; D013569:Synapses / Q000378:metabolism; D009435:Synaptic Transmission
chemical_list: D009638:Norepinephrine