Problem 22.48 -MC .. 70112 Constants Part A The biochemistry that takes place in

Question

Problem 22.48 -MC .. 70112 Constants Part A The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. These ions enter cells through narrow pores in the cell membrane known as ion channels. Each ion channel, which is formed from a specialized protein molecule, is selective for one type of ion. Measurements with microelectrodes have shown that a 0.30-nm-diameter potassium ion (K+) channel carries a current of 1.3 pA How many potassium ions pass through if the ion channel opens for 1.00 ms? Express your answer using three significant figures. View Available Hint(s) atoms Submit Provide Feedback Next>

Explanation / Answer

given

diameter of potassion ion channel, D = 0.3 mm

current, I = 1.3*10^-12 A

A. for t = 1*10^-3 s

number of potassion ions [passing throught he channel = n

charge on each pottasion ion = e = 1.6*10^-19 C

hence

I = charge/time

charge = ne = t*I = 0.0000000000000013 C

n = 8125 ions of pottasium

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