Depolarisation and hyperpolarisation

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Last updated 4:55 AM on 4/10/26
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13 Terms

1
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What causes changes in membrane potential?

  • Opening of Na+ or K+ gated channels allowing ions to flow across the plasma membrane


2
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What does ion flow across the membrane generate?

  • Changes in membrane potential and an electrical signal that conducts sensory or motor information


3
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What is the resting membrane potential of a neuron?

  • -70 mV


4
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What terms describe changes in membrane potential?

  • Depolarisation

  • Hyperpolarisation


5
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What is depolarisation?

  • Membrane potential becomes less negative


<ul><li><p>Membrane potential becomes less negative</p></li></ul><p></p>
6
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What causes depolarisation?

  • Opening of Na+ gated channels

  • Influx of Na+ ions into the ICF


7
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What happens to the ICF during depolarisation?

  • ICF gains positive ions; Cell interior becomes less negative


8
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What happens to membrane potential during depolarisation?

  • Becomes less negative (e.g., -70 mV to -60 mV)


9
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What is hyperpolarisation?

  • Membrane potential becomes more negative


<ul><li><p>Membrane potential becomes more negative</p></li></ul><p></p>
10
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What causes hyperpolarisation?

  • Opening of K+ gated channels

  • Efflux of K+ ions out of the ICF


11
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What happens to the ICF during hyperpolarisation?

  • ICF loses positive ions

  • Cell interior becomes more negative


12
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What happens to membrane potential during hyperpolarisation?

  • Becomes more negative (e.g., -70 mV to -80 mV)


13
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Why do ions flow across the plasma membrane?

  • Ions flow down their concentration gradient