Question

explain the process depolarization of the membrane of nerve fibre

Answer 1

depolarization of the membrane of a nerve fibre simultaneous of an axon immediately tightly enhances manifold its membrane permeability of Na Asa result in A+ ions diffuse across the membrane from the extracellular fluid (ECF) with their concentration is high to the inferior of fibre where the concentration is much lower ,but the membrane permeability of ke starts rising somewhat later only so there is simultaneous rise in the upward diffusion of K from the soil in feet interior having a higher K concentration
these effects lower the overall cation concentration outside and enhances that inside the membrane the membrane is thus deposited with its interior becoming electropositive to the exterior

the depolarization spreads producing a local current it induces nearby passive and Na channels to open and so to depolarize the nearby site
hence the initial depolarization passes out word overtake the membrane and spreads out in all directions from the site of simulation


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