Antagonism between manganese and caffeine on the SA node of the dog heart in situ.
D000818:Animals; D002110:Caffeine / Q000037:antagonists & inhibitors*; D002118:Calcium / Q000494:pharmacology; D004285:Dogs; D008345:Manganese / Q000494:pharmacology*; D009638:Norepinephrine / Q000037:antagonists & inhibitors; D011433:Propranolol / Q000494:pharmacology; D012849:Sinoatrial Node / Q000187:drug effects*; D013268:Stimulation, Chemical; D013779:Tetrodotoxin / Q000494:pharmacology
D002110:Caffeine; D008345:Manganese; D013779:Tetrodotoxin; D011433:Propranolol; D002118:Calcium; D009638:Norepinephrine