<Ol> <Li> The rate of ion transport through the channel is very high (often 10 ions per second or greater). </Li> <Li> Ions pass through channels down their electrochemical gradient, which is a function of ion concentration and membrane potential, "downhill", without the input (or help) of metabolic energy (e.g. ATP, co-transport mechanisms, or active transport mechanisms). </Li> </Ol> <Li> The rate of ion transport through the channel is very high (often 10 ions per second or greater). </Li> <Li> Ions pass through channels down their electrochemical gradient, which is a function of ion concentration and membrane potential, "downhill", without the input (or help) of metabolic energy (e.g. ATP, co-transport mechanisms, or active transport mechanisms). </Li> <P> Ion channels are located within the membrane of all excitable cells, and of many intracellular organelles . They are often described as narrow, water - filled tunnels that allow only ions of a certain size and / or charge to pass through . This characteristic is called selective permeability . The archetypal channel pore is just one or two atoms wide at its narrowest point and is selective for specific species of ion, such as sodium or potassium . However, some channels may be permeable to the passage of more than one type of ion, typically sharing a common charge: positive (cations) or negative (anions). Ions often move through the segments of the channel pore in single file nearly as quickly as the ions move through free solution . In many ion channels, passage through the pore is governed by a "gate", which may be opened or closed in response to chemical or electrical signals, temperature, or mechanical force . </P>

What is the process involved in the movement of ions through channels
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