01:119:116 Lecture Notes - Lecture 28: Extracellular Fluid, Osmoregulation, Body Fluid
15 Mar 2016
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Molecular weight of substance expressed in grams. Ex: water = 2x1+16= 18 amu = 1 mole h2o. Ex: glucose = 6x12+12x1+6x16 = 180 amu = 1 mol g: osmole. Accounts for # particles produced when a solute dissolves. Ex: glucose 1 type of particle. 1 mole glucose in solution = 1 osmole. Ex: nacl 1 na and 1 cl in solution. 1 mole nacl = 2 osmoles: osmolarity. Measure of # of osmoles of solute per liter of solution. Measure of tendency of water to move into a solution by osmosis. Osmosis water moves from hypoosmotic (hypotonic) to hyperosmotic (hypertonic) Excretory systems: collect fluid from blood or interstitial tissue, osmoregulation. Regulation of concentration and distribution of ions: excretion. Osmoconformers: all are marine animals, body fluids in osmotic equilibrium with surrounding sea water, water with stable composition. Ocean dehydrating and hyperosmotic relative to body fluids. Many fish drink lots of water and eliminate salts through gills and kidneys: fresh water.
