A protein that forms a pore in cell membranes, allowing specific ions to pass through and thereby enabling electrical signaling and maintaining cellular ion balance. These channels can be gated by various stimuli including voltage, ligands, or mechanical force.
From 'ion' (Greek 'ienai' meaning to go) and 'channel' (Old French 'chanel' meaning pipe or groove). The concept developed in the 1950s-60s as electrophysiology techniques revealed how cells generate electrical signals through selective ion movement.
Ion channels are like incredibly selective bouncers at the cellular membrane club - they can distinguish between ions that differ by less than one angstrom in size! A single channel can allow millions of ions to pass per second, yet maintain exquisite selectivity.
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