Biology 2601A/B Lecture Notes - Lecture 10: Extracellular Fluid, Body Fluid, Epithelium
13 Nov 2018
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Lecture 10 water and salt regulation i. Body fluid compartments: body fluids contain water, inorganic ions (na+, k+, cl-), organic solutes (amino acids, glucose, urea) and proteins = account for 60% of body weight of young adults. Humans consume on average 7% of body water content per day. Kidney filter 120 ml of plasma/min to maintain osmotic pressure + homeostasis (173 l per day!!) 60% water, 40% non-water components (protein, lipid, bone) Osmotic regulation - why do we care - what does it affect: affects water flow (water moves from low to high concentration, cell volume (don"t want cells to explode/shrink, edema (swelling of tissues, pupils, ankles, blood volume. Everything outside the cells = extracellular fluids (divided into 2 compounds) Interstitial fluid: fluid in the spaces around cells but not inside blood vessels: blood plasma: plasma fraction of the blood. Three major body-fluid compartments of an animal: intracellular fluids, interstitial fluids, blood plasma.
