NURS 106 Lecture Notes - Lecture 15: Membrane Potential, Resting Potential, Active Transport
12 Oct 2018
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Document Summary
Membrane potential difference in the relative number of cations (+) and anions (-) in the icf and ecf. Polarized electrically, separation of charges across the membrane or a. Sodium concentration in blood should be higher than potassium. Localized change in a resting potential, caused by a stimulus/triggering event. Electrical impulse produced by a graded potential, propagates from axon to large signals travel long distances creates a 100mv difference propagated throughout the entire membrane in nondecremental fashion propagation . Less polarized than at resting potential. Sodium gates close, potassium gates open (k efflux) Needs to hit -50mv, and peak exists due to at 30mv as sodium channels quickly. Last action potential has the same amplitude as the first. Absolute and relative (during repolarization as potassium gates are open) 2 types of propagation: continuous conduction , saltatory conduction the membrane. Conduction in unmyelinated fibres , spreads along every portion of. Rapid in myelinated fibres, jumping over sections of insulated myelin.
