Assertion: potassium | /r/HasProperty | the principal
Facets:
Source sentences:
text: Potassium (K+) is the principal positively charged ion (cation) in the fluid inside of cells, while sodium (Na+) is the principal cation in the extracellular fluid.
text: An alkaline metallic element (atomic number 19; atomic weight 39.09), potassium is the principal intracellular cation (positive ion) and is critical in the synthesis of new molecules, transferring energy, muscle contraction, transmitting neural impulses and maintaining blood pressure.