Intracellular
In cell biology, molecular biology and related fields, the word intracellular means "inside the cell".[1]
It is used in contrast to extracellular (outside the cell). The cell membrane (and, in many organisms, the cell wall) is the barrier between the two, and chemical composition of intra- and extracellular milieu (Milieu intérieur) 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.[2][3]
A commonly used notation is to denote the intracellular concentration of a substrate . For example, is the intracellular concentration of Calcium.
![{\displaystyle [S]_{i}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/5c60d11f22c583dc2fe578a4e399a033dc023257)
![{\displaystyle [Ca^{2+}]_{i}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/e1853a608af190cfdf3cd960b0714c4561f48cb4)
See also[edit]
References[edit]
- ↑ "Definition of Intracellular".
- ↑ Matsudaira, Paul T.; Lodish, Harvey F.; Arnold Berk; Kaiser, Chris; Monty Krieger; Matthew P Scott; Anthony Bretscher; Hidde Ploegh (2008). Molecular cell biology. San Francisco: W.H. Freeman. ISBN 978-0-7167-7601-7. Search this book on
- ↑ Benito B, Garciadeblás B, Schreier P, Rodríguez-Navarro A (April 2004). "Novel p-type ATPases mediate high-affinity potassium or sodium uptake in fungi" (PDF). Eukaryotic Cell. 3 (2): 359–68. doi:10.1128/ec.3.2.359-368.2004. PMC 387655. PMID 15075266.
External links[edit]
- Intracellular at the US National Library of Medicine Medical Subject Headings (MeSH)
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