Final answer:
The plasma concentrations of glucose and ions are most akin to those found in the interstitial fluid compartment.
Step-by-step explanation:
The concentrations of glucose and ions in plasma are most similar to those in the interstitial fluid (IF) compartment of the extracellular fluid (ECF).
Both plasma and IF have high concentrations of sodium, chloride, and bicarbonate, although plasma typically has a higher protein concentration compared to IF.
In contrast, the intracellular fluid (ICF) compartment has higher concentrations of potassium, phosphate, magnesium, and protein, making its composition quite different from plasma and IF.