I. Quantitative studies on the time course of changes in contractile force provoked by changes in heart rate. II. Influence of noradrenaline and hexobarbital-Na.
D000818:Animals; D016275:Atrial Function; D002118:Calcium / Q000378:metabolism; D002462:Cell Membrane / Q000378:metabolism; D003864:Depression, Chemical; D004357:Drug Synergism; D004558:Electric Stimulation; D006168:Guinea Pigs; D006207:Half-Life; D006321:Heart / Q000502:physiology*; D006325:Heart Atria / Q000187:drug effects; D006339:Heart Rate; D006591:Hexobarbital / Q000494:pharmacology*; D009119:Muscle Contraction / Q000187:drug effects; D009206:Myocardium / Q000378:metabolism; D009638:Norepinephrine / Q000494:pharmacology*; D013268:Stimulation, Chemical; D013997:Time Factors
D006591:Hexobarbital; D002118:Calcium; D009638:Norepinephrine