![]() In the renal tubule cells the epithelium isĪ single layer of cells, joined by junctional complexes near their luminalīorder ( Fig. The calcium and magnesium content is 25 and 1 mol, The ECV is remarkably constant through life and under disease conditions.Įach body (weight 70 kg) contains 4 mol ofīoth sodium and potassium (ie, the total ion pool). Consequently, the body water fractionįalls with increasing body weight and age. The relative content of body fat rises with increasing age and body weight, and the relative Sedentary, overweight persons contain only 50-55 % water The average for most healthy persons is 60% Such differences show sex dependency, but the important factor is the relative content of body fat, since fat tissue contains significantly less water (only 10%) Babies have a tenfold higher water turnover per kg of body weightĪs an average females have a low body water Values are observed in the newborn and in extremely fit athletes with minimalīody fat. Parts of water (69%) of the total body weight in all persons. The so-called lean body mass, which means a body stripped of fat, contains 0.69 They are said to be isosmolal, because they have the same osmolality. The threeĬompartments have the same concentration expressed as mOsmol per kg of water Permeable membranes separate the three compartments, so that they containĪlmost the same number of osmotically active particles per kg. The intracellular fluid volume (ICV), the interstitial fluid volume (ISV) and The three major body fluid compartments are Regulation of renal sodiumįirst about the nephron ( paragraph 1 of Chapter Renin-angiotensin-aldosterone cascade, 7. Intracellular and the extracellular fluid. ![]() One disintegration per s equals one Bq.ĭestributed between two compartments separated by the cell membrane: The Measured as the number of radioactive disintegrations per s (in Becquerel or Bq per l).
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