The biochemistry that takes place inside cells depends on various elements, such

Question

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. When an ion channel opens in a cell wall, monovalent (charge e) ions flow through the channel at a rate of 10 x 102 ions/s. What is the current through the channel? Express your answer using two significant figures. The potential difference across the ion channel is 70 mV. What is the power dissipation in the channel? Express your answer using two significant figures.

Explanation / Answer

a) current = charge flow/second = 1.0*10^7*1.6*10^-19 = 1.6*10^-12 A (or) 1.6pA {where p= pico= 10^-12} b) v = 70mV power= v*current= 70mV*1.6pA = 0.112 pW

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