ch 42 review notes

ch 42 review notes - CHAPTER 42: Water and Electrolyte...

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CHAPTER 42: Water and Electrolyte Balance in Animals Water balance; most common ions = Na, Cl, K, Ca Electrolytes : a compound that dissociates into ions when dissolved in  water.  4 Ways Animals GAIN water: 1. Absorbing it via osmosis 2. Drinking 3. Eating 4. As a by-product of cellular respiration LOSE water by; 2. evaporation 3. osmotic loss I. Diffusion - substances moving from higher conc   lower conc Compounds diffuse along their  concentration gradient Solute - a dissolved substance Selectively permeable membrane - a membrane that some solutes can  cross more easily than other solutes can. (ex- phospholipids bilayer) Equilibrium - when molecules move back and forth across the membrane at  equal rates.  Osmolarity - the concentration of dissolved substances in a solution  (moles/liter) Osmosis - the movement of water from areas of higher concentration  lower. Isotonic - solute concentrations inside and outside these organisms are  equal.  SALTWATER FISH Osmoconformers - don’t actively regulate the osmolarity of their tissues, but  they do regulate the composition of solutes inside their cells.  Ex: marine invertebrates
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Osmoregulators - actively regulate osmolarity inside their bodies to achieve  homeostasis.  Osmoregulation - the process by which living organisms control the  concentration of water and salt in their bodies. 
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This note was uploaded on 02/10/2010 for the course BIO 118 taught by Professor Wilson during the Spring '09 term at Binghamton University.

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ch 42 review notes - CHAPTER 42: Water and Electrolyte...

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