PO43- Function & Distribution
• PO43- functions as a buffer, as part of nucleic acids, in formation of bone, etc.
• 86% of PO43- is locked in bone
• 14% is intracellular
• 0.03% is extracellular
• 90% of plasma PO43- is free & 10% is bound to proteins (& therefore cannot be filtered by the glomerulus)