[Effects of stimulation frequency, calcium concentration and temperature on the force-velocity relations of bullfrog atrial muscle].
D000818:Animals; D016275:Atrial Function; D002118:Calcium / Q000494:pharmacology*; D004558:Electric Stimulation; D066298:In Vitro Techniques; D009200:Myocardial Contraction; D011892:Rana catesbeiana; D013696:Temperature
D002118:Calcium