[Aging of the bronchial tree and the bronchial vascular system. 1. Changes in bronchial muscular tone due to aging].
D000109:Acetylcholine / Q000494:pharmacology; D000375:Aging; D000818:Animals; D001980:Bronchi / Q000187:drug effects / Q000502:physiology*; D004285:Dogs; D009129:Muscle Tonus / Q000187:drug effects; D012701:Serotonin / Q000494:pharmacology; D013268:Stimulation, Chemical
D012701:Serotonin; D000109:Acetylcholine