Effect of thyroid hormone on the frequency-force relationship of atrial myocardium from the guinea pig.
D000818:Animals; D002118:Calcium / Q000494:pharmacology; D006168:Guinea Pigs; D006325:Heart Atria / Q000187:drug effects*; D006980:Hyperthyroidism; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009638:Norepinephrine / Q000494:pharmacology; D012110:Reserpine / Q000494:pharmacology; D013974:Thyroxine / Q000494:pharmacology*
D012110:Reserpine; D013974:Thyroxine; D002118:Calcium; D009638:Norepinephrine