Feedback loops involved in cardiac excitation-contraction coupling: evidence for two different pathways.
D000200:Action Potentials; D000818:Animals; D002415:Cats; D005246:Feedback; D006321:Heart / Q000502:physiology*; D066298:In Vitro Techniques; D009200:Myocardial Contraction; D013314:Stress, Mechanical; D013997:Time Factors