INTRACELLULAR

In cell biology, molecular biology and related fields, the word 'intracellular' means "inside the cell".
It is used in contrast to extracellular (outside the cell). The cell membrane (and, in plants, the cell wall) is the barrier between the two, and chemical composition of intra- and extracellular ''milieu'' can be radically different. In most organisms, for example, a Na+/K+ ATPase maintains a high potassium level inside cells while keeping sodium low, leading to chemical excitability.