An antagonism in the action of calcium and strontium ions on the frog's heart.
D000818:Animals; D001001:Anura; D001808:Blood Vessels / Q000187:drug effects*; D002118:Calcium / Q000494:pharmacology*; D006321:Heart; D007477:Ions; D013324:Strontium / Q000494:pharmacology*
D007477:Ions; D002118:Calcium; D013324:Strontium
CALCIUM/effects; STRONTIUM/effects; VESSELS/effect of drugs on