Nerve signals in the body occur when a small voltage, called an action potential

Question

Nerve signals in the body occur when a small voltage, called an action potential, is applied across the membrane of a cell. When this action potential is applied across a region of the cell membrane called an ion channel, current in the form of moving potassium ions will be established across the cell. If, during an action potential of 80 mV , a single ion channel with a resistance of 12 GOhms, is opened for 15 ms , approximately how many singly-ionized potassium ions travel through the channel during this time

Explanation / Answer

V = iR

current i = q/t

charge q = ne

v = neR/t

80*10^-3 = (n*1.6*10^-19*12*10^9)/0.015

numer of singly ionized ions = n=625000          <<<<<<<----------------answer

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