IONS-INTRACELLULAR FLUID (ICF)
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SUMMARY
1. 98% of total body potassium is intracellular, concentration ~150 mmol/l
2. K+, Na+, Mg+ are the major cations present
3. Organic phosphates are the major anions
4. When ECF K+ is < 3.0, intracellular K+ will diffuse out, but H+ will diffuse in, hence the intracellular net charge will remain constant
5. 66% of total body water is intracellular
Reference(s)
Barrett, K.E., Barman, S.M., Brooks, H.L., X, J. and Ganong, W.F. (2019). Ganong’s review of medical physiology. 26th ed. New York: Mcgraw-Hill Education