Innervation of the lung of the Australian snake-necked tortoise, Chelodina longicollis.
1. The innervation of the smooth muscle of the lung of the Australian snake-necked tortoise. Chelodina longicollis, was investigated using in vitro pharmacological techniques. 2. The smooth muscle bands of the lung were innervated by cholinergic excitatory fibres and non-cholinergic, non-adrenergic, excitatory fibres. 3. Inhibitory responses of the smooth muscle bands to transmural stimulation occurred infrequently following excitatory responses and the neurotransmitter(s) involved were not determined. Noradrenaline caused a beta-adrenoceptor mediated relaxation of the smooth muscle bands. 4. The excitatory response caused by cholinergic and non-cholinergic, non-adrenergic fibres was tetrodotoxin resistant.
D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D002217:Carbachol / Q000494:pharmacology; D004246:Dimethylphenylpiperazinium Iodide / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004558:Electric Stimulation; D005260:Female; D008168:Lung / Q000294:innervation*; D008297:Male; D009130:Muscle, Smooth / Q000187:drug effects; D009638:Norepinephrine / Q000494:pharmacology; D012601:Scopolamine / Q000494:pharmacology; D013373:Substance P / Q000494:pharmacology; D013779:Tetrodotoxin / Q000494:pharmacology; D014426:Turtles / Q000033:anatomy & histology*
D013373:Substance P; D013779:Tetrodotoxin; D004246:Dimethylphenylpiperazinium Iodide; D002217:Carbachol; D012601:Scopolamine; D000109:Acetylcholine; D009638:Norepinephrine