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Unformatted text preview: BIOELECTRIC PHENOMENA: 1. Membrane Potential a. Membrane potentials in cells are created by separation of ions across the external membranes of cells. b. This is regulated by channels/pumps c. Membrane potential is especially critical in what cells: NERONS 2. Resting Membrane Potential & The Nernst Equation a. Resting potential is defined as Vm = vi - vo, where vo (the outside voltage) is defined as 0 mV (ground) for convention. Vm is thus the potential difference across a membrane at rest. (Membrane potential were no active changes in membrane potential (usually negative more excess negative charge inside than outside) b. For most cells, the resting membrane potential is ~ -60 mV. c. Ion gradients are used to make ATP, drive transport processes, generate electrical signals 3. Basic Laws of Biophysics a. Ohm's Law i. In addition to diffusion from pure concentration differences, charged particles experience a force resulting from other charged particles and electric fields....
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- Spring '08