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This 3 page Class Notes was uploaded by Sarah Mickelsen on Thursday September 10, 2015. The Class Notes belongs to BIO264 at Brigham Young University - Idaho taught by Groesbeck in Spring 2015. Since its upload, it has received 36 views. For similar materials see Human Physiology & Anatomy I in Nursing and Health Sciences at Brigham Young University - Idaho.
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Date Created: 09/10/15
Electrophysiology Membrane potentials NaKATPase pump moves 3 Na ions out and 2 K ions in primary active transport uses ATP Leak channels K channels open channels that allow for the diffusion of K This creates a negative charge inside the membrane The K will leave until the electrical charge gets to resting membrane potential 0 70 mV resting membrane potential 0 every cell has its own potential Factors that In uence membrane potentials Increase Na permeability depolarization Increase K permeability hyperpolarization Increase Ca 2 permeability depolarization Increase extracellular K hyperpolarization Decrease extracellular K depolarization Increase extracellular Na no change Decrease K permeability depolarization Polarization Depolarization charges goes up more positive Repolarization charge goes back to resting potential Hyperpolarization charges goes down more negative Excitable Tissues Neurons Muscle cells 0 Graded potentials dendrites soma I Ligand chemically gated channels I Depolarizing Ca2 Na I Hyperpolarizing K Cl I Magnitude proportional to stimulus strength I Summate may be added together I Short distance signals local potential 0 Action Potentials can reach about 30mV I All or nothing I Long distance signaling I Voltage gated channels Na K I Do not decrease in size I Require a threshold stimulus at the trigger zone 91015 305 PM
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