Chapter 44 notes

Chapter 44 notes - Chapter 44 OsmoregulationMaster subtitle...

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Click to edit Master subtitle style 6/13/11 Chapter 44 Osmoregulation and Excretion
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6/13/11 Concept 44.1: Osmoregulation balances the uptake and loss of water and solutes
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6/13/11 Clicker Question Inside a “cell” you construct, you place a 1 M sugar solution. You place the cell in a 2 M sugar solution. What happens? Water enters the cell faster than it leaves. Water leaves the cell faster than it enters. * Water leaves and enters at the same rate. Sugar diffuses into the cell.
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6/13/11 Osmosis Osmosis: the movement of water across a selectively permeable membrane Water moves from an area where solute concentration is low to an area where solute concentration is high Special case of diffusion Figure 44.2
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6/13/11 Osmolarity Solute concentration expressed as molarity (i.e., moles/L) Figure shown of a 2% sucrose solution – three situations are under that picture (100% water = hyposmotic; 10% sucrose = hyperosmotic; 2% sucrose = isoosmotic)
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6/13/11 Osmotic Challenges Osmoconformers Isotonic to their surroundings, do not regulate the osmolarity Osmoregulators Use energy to control uptake and loss of water Stenohaline Cannot tolerate substantial changes in external osmolarity
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6/13/11 Meeting Osmotic Challenges Marine bony fishes Hypoosmotic to sea water Lose water by osmosis Freshwater bony fishes Hyperosmotic to freshwater Constantly gain water by osmosis Figure
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6/13/11 Meeting Osmotic Challenges Shark’s use a different strategy Live in salt water, but are hyperosmotic to it
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Chapter 44 notes - Chapter 44 OsmoregulationMaster subtitle...

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