Evidence for two components in frog cardiac mechanical activity.
D000818:Animals; D001001:Anura; D001692:Biological Transport / Q000187:drug effects; D002118:Calcium / Q000378:metabolism*; D004837:Epinephrine / Q000494:pharmacology; D006325:Heart Atria; D008094:Lithium / Q000494:pharmacology; D008345:Manganese / Q000494:pharmacology; D008564:Membrane Potentials / Q000187:drug effects; D013779:Tetrodotoxin / Q000494:pharmacology
D008345:Manganese; D013779:Tetrodotoxin; D008094:Lithium; D002118:Calcium; D004837:Epinephrine