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
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
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What is the current density in the ion channel?
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Transcribed Image Text: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.
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