104Lecture4

104Lecture4 - Lecture 4 4/12/11 Background reading: 5 th...

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Unformatted text preview: Lecture 4 4/12/11 Background reading: 5 th Edition Chapter 11: pages 651-675; 680-687 4 th Edition Chapter 11: pages 615637; 643-649 Transit of Small Molecules across Membranes: Membrane potential Ion channels Ionophores Passive transport Carrier proteins Active transport Organelle topography Membrane Potential Difference in electrical charge between two sides of a membrane creates a membrane potential. Comparison of Ion Concentrations Inside and Outside Cell Component Inside (mM) Outside mM) Cations: Na + 5 15 145 K + 140 5 Ca 2+ 10-4 1 2 H + 7x10-5 4x10-5 (pH 7.2) (pH 7.4) Anions: Cl- 5 15 110 Organic 138 9 Construct two compartments separated by a black membrane: Electrodes 150 mM NaCl 150 mM KCl Black membrane No electrical potential across above membrane since it is impermeable to ions and the concentrations on each side would be maintained....
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104Lecture4 - Lecture 4 4/12/11 Background reading: 5 th...

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