KINE 1P90 Lecture Notes - Lecture 4: Axon Hillock, Resting Potential, Peripheral Nervous System
4 Oct 2013
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Lecture 4 anatomy of the neuron membrane potential wednesday september 18th. The anatomy of the nerve mylein insulates the axon and allows for faster nerve conduction. Passive diffusion of na and k across the plasma membrane. Active transport of na and k across the plasma membrane via the na k atpase. The effect of potassium on the membrane potential much more potassium inside than outside this creates a concentration gradient. The effect of na on the membrane potential the equilibrium potential for potassium is -90 the equilibrium potential for na is +60. The actual membrane potential for a nerve cell is -70 membrane potential potasum ions slowly leak down concentration gradient and out of cell sodium continually leaks inward. Depolarization the membrane becomes less polarized compared to the resting potential. Repolarization the membrane returnd to resting potential after having been depolarized. Action potential brief, rapid large (100mv) changes in membrane potential during action potential, potential reverses becoming positive.
