Most vertebrates maintain homeostasis in regard to the total solute concentrations of their extracellular fluids and the concentrations of specific inorganic ions. The kidneys participate in regulating the extracellular fluid concentration of all ions below except

A. Ca2+ ions.
B. Na+ ions.
C. K+ ions.
D. Fe2+ ions.
E. Cl- ions.


Answer: D

Biology & Microbiology

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