BIO 211 Lecture Notes - Lecture 3: Body Water, Plasma Osmolality, Molality
4 Aug 2020
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Document Summary
Homeostasis and the body fluid volumes in humans. Total body water = 2/3 body weight. Intracellular volume = 2/3 total body water. Extracellular volume = 1/3 total body water. Total body = 2/3 body weight . 6 x body weight. Variability among individuals amount of adipose tissue. Intracellular volume = 2/3 total body water . 4 x body weight. Extracellular volume = 1/3 total body water . 2 x body weight. To remain properly hydrated, water intake must equal water output. Metabolic water or water of oxidation (10%) Insensible losses through the skin and lunges (28%) Increases in plasma osmolality trigger thirst and release of antidiuretic hormone (adh) Inorganic salts, all acids and bases, some proteins. 1 m salt (nacl) = 2 m dissolved particles, hence enhanced osmotic. Power to cause fluid shifts compared to 1m glucose or other non- electrolyte. = millimoles of charge per liter = meq/l. Electrolyte concentration is expressed in milli-equivalents per liter .
