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 1.8 pA. Part A How many potassium ions pass through if the ion channel opens for 1.0 ms? IVE ΑΣΦ Submit Request Answer Part B What is the current density in the ion channel? — ΑΣΦ Submit Request Answer ? ? ions A/m²

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.