the effects of 20 mumol/l amiloride , 10 mumol/l furosemide and 1 mmol/l ouabain on cell na and k concentrations were investigated by flame microphotometry in isolated rat medullary collecting tubules and medullary thick ascending limbs ( mct and mal ) as a function of the external potassium concentration [ ke ] .
C0002502
amiloride
C0032821
potassium