Differences in Na and K content between the atrium and ventricle of the frog's heart and their dependence on metabolism.
D006321:Heart; D006325:Heart Atria; D006352:Heart Ventricles; D006801:Humans; D009206:Myocardium / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*
D012964:Sodium
MYOCARDIUM/chemistry; SODIUM/chemistry