The neurophysiological basis of anxiety: a hypothesis.
D000313:Adrenal Medulla / Q000502:physiology*; D000818:Animals; D001007:Anxiety; D001519:Behavior; D004285:Dogs; D004644:Emotions; D005239:Fear; D006801:Humans; D008688:Methacholine Compounds; D009424:Nervous System Physiological Phenomena; D009497:Neurotic Disorders / Q000209:etiology
D008688:Methacholine Compounds