00:03Ion channels are proteins found in the cell membrane that allow charged particles called ions to move into or out
00:10of a cell.
00:11Because the cell membrane is relatively impermeable to most ions, ion channels play a critical role in controlling electrical signals
00:18in the body,
00:19especially in excitable cells like neurons, cardiac cells, and muscle cells.
00:26Structurally, ion channels are typically made up of multiple protein subunits that come together to form a central pore that
00:32provides a pathway for ions across the cell membrane.
00:36Ion channels are selective, meaning each channel allows only certain ions to travel through it.
00:41This selectivity depends primarily on the structure and charge properties of the channel pore,
00:46which can cause it to favor specific ions based on factors like their size and electrical charge.
00:53While some channels, known as leak channels, remain open all the time, others can open and close, which is a
00:59process known as gating.
01:01Different types of ion channels are classified based on what causes them to open.
01:06Voltage-gated ion channels, for example, open in response to changes in electrical charge across the membrane.
01:12Ligon-gated ion channels, on the other hand, open when a specific molecule binds to them.
01:17There are also channels that open in response to other stimuli, including mechanical forces like pressure or stretch,
01:24as well as temperature changes and other sensory signals.
01:28The movement of ions through ion channels can make the inside of a cell more positive or more negative,
01:34and this is the basis of electrical signaling in excitable cells like neurons, cardiac cells, and muscle cells.
01:41Because this signaling is essential for normal function, problems with ion channels can lead to a wide range of disorders
01:47known as channelopathies.
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