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Week%202%20-Teacher%20Edition - BIPN 100 Dr Fortes Lecture...

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BIPN 100 Chris Childers Dr. Fortes Winter 09 Lecture 1 – January 5 th Lecture 2 – January 7 th Lecture 3 - January 9 th Diffusion & Transport Pathways Na+/K+ ATPase Ion Concentrations Ohm’s Law Fick’s Equation Nernst Equation Nernst Cont… Goldman-Hodgkin-Katz Membrane Potential Diffusion & Transport Diffusion is the flow of molecules from an area of _______ concentration to an area of _______concentration. This concentration provides the “driving force” for a number of physiological processes. The other “driving force” that we will see later in the course is the __________________. What is osmosis? Osmosis – water down its concentration gradient, from an area of low salt (high water concentration) to an area of high salt concentration (low water concentration) Describe the structure of the lipid bilayer. How does the structure relate to its permeability? What molecules can easily dissolve through the membrane? Bilayer – The bilayer is hydrophobic so only lipid soluble molecules can dissolve in the bilayer o Examples of these molecules include: gases (O2, CO2, NO), steroid hormones, thyroid hormones, vitamin A, E, K, D, (some) drugs – alcohol, aspirin o
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