Potassium and sodium exchange in different parts of the frog heart.
D000818:Animals; D001001:Anura; D009206:Myocardium / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism*; D014882:Water-Electrolyte Balance
D012964:Sodium; D011188:Potassium