Ion Channels

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4 Terms

1
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Selective Channels

  • only allow one ion to pass through

    • Na+

    • K+

2
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Nongated

  • always open, ions flow freely through channel

  • based on gradient

    • chemical and/or electrical

3
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Gated

  • always closed until something opens

  • usually when

    • chemical binds to receptor site on chemically gates

    • voltage of membrane changes, voltage gated channels

4
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Functionally unique

  • functions of gated and nongated both necessary

  • nongated = resting membran potential

  • chemically gated = receive incoming stimulus to initiate depolarization and action potential

  • voltage gated = generation and propagation of action potential