title: In vivo roentgenographic examination of parasympathetic innervation of small airways. Use of powdered tantalum and a fine focal spot x-ray tube.
mesh_terms: D000818:Animals; D001980:Bronchi / Q000294:innervation*; D001995:Bronchography / Q000295:instrumentation; D002415:Cats; D004285:Dogs; D004558:Electric Stimulation; D009119:Muscle Contraction; D010275:Parasympathetic Nervous System / Q000502:physiology*; D013635:Tantalum; D014132:Trachea / Q000294:innervation; D014628:Vagotomy; D014630:Vagus Nerve / Q000502:physiology
chemical_list: D013635:Tantalum