BIOL 2510 Lecture Notes - Lecture 8: Extracellular Fluid, Fluid Balance, Plasma Osmolality
27 Sep 2017
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Chapter 26 fluids and electrolytes and acid-base balance. Infant (low in fat and bone mass) body has approx. 75% water by weight: avg. adult body has approx. 40-60% water by weight: older adult- 40-45% by weight, total water content declines throughout life. Intracellular fluid compartment (icf) (cytoplasm: known as cytosol within cells, makeup approx. two-thirds of water in body contained in cells= 25l of body water. Other ecf"s: lymph, cerebrospinal fluid, eye humor, synovial fluid, serous fluid, gastrointestinal secretions. Solutes in body fluids fluid content = solvent which is mainly composed of water > 90: dissolved substances in fluids are called solutes (ex. Nonelectrolytes: organic molecules such as glucose, lipids, cholesterol and urea, no electrical charge, do not dissociate in the solution, not responsible for fluid shifts in body. Electrolytes in body fluid each compartment needs the right types and levels of electrolytes for proper function of neurons, muscle cells and other body cells.
