How can one have an imbalance in a substance, but not actually have elevated or deficient levels of that substance in the body?

How can one have an imbalance in a substance, but not actually have elevated or deficient levels of that substance in the body? Without having an absolute excess or deficiency of a substance, one can have too much or too little of that substance in a given compartment. Such a relative increase or decrease is due to a redistribution of water or the ion in the body’s compartments.

Explanation:

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.