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 1.0×107ions/s.

What is the current through the channel? (answer is not 1*10^7)

The potential difference across the ion channel is 70 mV. What is the power dissipation in the channel? (answer is not 7*10^5)

Explanation / Answer

current flowing = dq/dt

charge flowing per seconh

= 10^7*1.6*10^-19 / 1

= 1.6*10^-12 C /s = 1.6*10^-12 A

power dissipation = IV = 1.6*10^-12 * 70*10^-3

= 1.12*10^-13 W

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