Modification of the effects of histamine and norepinephrine on the sinoatrial node pacemaker by potassium and calcium.
D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D006168:Guinea Pigs; D006339:Heart Rate / Q000187:drug effects; D006632:Histamine / Q000494:pharmacology*; D066298:In Vitro Techniques; D008297:Male; D009638:Norepinephrine / Q000494:pharmacology*; D009994:Osmolar Concentration; D011188:Potassium / Q000494:pharmacology*; D012849:Sinoatrial Node / Q000187:drug effects*
D006632:Histamine; D011188:Potassium; D002118:Calcium; D009638:Norepinephrine