<prompt> Plasma osmolarity is maximally affected by-NaKGlucoseUrea  <response>: Ans. is a i.e., Na Normal osmolarity of extracellular body fluids is about 290 mOsmL. Important contributors of body fluid osmolarity areConstituentConcentration mMoleLNa135-155Cr90-110HCO3-25K3?5 - 5?0Glucose34 - 5?6 mmoleL 60-100 mgdlBUN3?6 - 7?1 mmoleL 10-20 mgdl 