The dependence of cardiac contraction on depolarization and slow inward current.
D000200:Action Potentials; D000818:Animals; D002118:Calcium / Q000378:metabolism; D006168:Guinea Pigs; D006321:Heart / Q000502:physiology*; D006352:Heart Ventricles; D066298:In Vitro Techniques; D008564:Membrane Potentials; D009119:Muscle Contraction; D009206:Myocardium; D010210:Papillary Muscles
D002118:Calcium