BIOL 3060 Lecture Notes - Lecture 6: Resting Potential, Sodium-Potassium Alloy, Square Wave

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In all cells, more na outside than inside, and there is more k inside than compared to outside. The movement of the k+ is responsible for the resting potential (-60mv) At certain point, equilibrium is reached of the k+ being moved out and the ve charge holding k+ in = electrochemical equilibrium, diffusion doesn"t stop, but equilibrium of charge and ion movement is established. The resting potential is equal to the equilibrium potential of k. When an electrical stimulus is applied, a transient change in the membrane potential is produced, but recovery to resting potential is very quick, the k+ and na+ channels don"t change shape/degree of movement. There are events/things happening where the response to the hyper/depolarization is not the same shape or duration as the stimulus. Resistance to ion flow through k+ channels and follow ohms law (v = ir, v. = potential difference, i = current, r = resistance).

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