chapter5c Membrane Dynamics 3

chapter5c Membrane Dynamics 3 - Chapter 5c Membrane...

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Chapter 5c Membrane Dynamics
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Figure 5-25 The Body Is Mostly Water Distribution of water volume in the three body fluid compartments 1 liter water weighs 1 kg or 2.2 lbs 70 kg X 60% = 42 liters for avg 154 lb male
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Aquaporin Moves freely through cells by special channels of aquaporin
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Figure 5-26 Osmosis and Osmotic Pressure Osmolarity describes the number of particles in solution Volumes equal Osmotic pressure is the pressure that must be applied to B to oppose osmosis. Volume increased Volume decreased Two compartments are separated by a membrane that is permeable to water but not glucose. Water moves by osmosis into the more concentrated solution. Glucose molecules Selectively permeable membrane A B 1 3 2
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Table 5-5 Osmolarity: Comparing Solutions Hyper / Hypo / Iso are relative terms Osmolarity is total particles in solution Normal Human body around 280 – 300 mOsM
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Table 5-6 Tonicity Solute concentration = tonicity Tonicity describes the volume change of a cell placed in a solution
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Figure 5-27a Tonicity Tonicity depends on the relative concentrations of nonpenetrating solutes
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Figure 5-27b Tonicity Tonicity depends on nonpenetrating solutes only
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Figure 5-28 Tonicity Tonicity depends on nonpenetrating solutes only (a) (b) (c) (d) Cell Solution H2O
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Plasmolysis and Crenation RBC’s
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Table 5-7 Osmolarity and Tonicity
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Table 5-8 Intravenous Solutions
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Electricity Review 1. Law of conservation of electrical charges 2. Opposite charges attract; like charges repel each other 3. Separating positive charges from negative charges requires energy 4. Conductor versus insulator
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Separation of Electrical Charges Resting membrane potential is the electrical gradient between ECF and ICF (b) Cell and solution in chemical and electrical disequilbrium. Intracellular fluid
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chapter5c Membrane Dynamics 3 - Chapter 5c Membrane...

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