01:119:116 Lecture Notes - Lecture 28: Extracellular Fluid, Fluid Compartments, Osmoregulation
18 Jun 2020
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Chapter 44. 1 and 44. 4: introduction, body fluids. Physiological systems of animals operate in a fluid environment. Composition of fluids depends on balancing uptake and loss of h20 and solutes. Based on balancing the uptake and loss of water and solutes: solutes and solutions, mole- molecular weight of a substance expressed in grams. H2o= (2x1) + (1x16)= 18 amu 1 mole= 18g. Glucose= (6x12)+(12x1)+(6x16)=180 amu 1 mole= 180g: osmole= takes into account number of particles produced when a solute dissolved. Glucose dissolves to give just one type of particle. Nacl dissolved in solution to give na+ and cl- 1 mole nacl in solution= 2 osmoles: osmolarity= measure of number of osmoles of solute per liter of solution expressed as. Osmosis is the movement of water from hypoosmotic (hypotonic) to hyperosmotic (hypertonic) Live in water that has stable composition: osmoregulators= control internal osmolarity independent of that in external environment. Control water uptake and loss in a hyperosmotic or hypoosmotic environment.
