title: Mechanism of activation of contraction in frog ventricular muscle.
mesh_terms: D000200:Action Potentials; D000818:Animals; D001001:Anura; D002118:Calcium / Q000502:physiology; D004558:Electric Stimulation; D005110:Extracellular Space; D066298:In Vitro Techniques; D008564:Membrane Potentials; D009200:Myocardial Contraction; D011894:Rana pipiens; D013997:Time Factors; D016276:Ventricular Function
chemical_list: D002118:Calcium