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Depolarization-repolarization and hyperpolarization

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Reference no: EM131484775

What happens during the three phases (depolarization, repolarization and hyperpolarization) of an action potential regarding K+ and Na+ molecules?

These are my options (apparently, some can be multiple answers):

Na+ Depolarization:

  • Na+ flows into the cell via voltage-gated Na+ channels
  • Na+ flows out of the cell via the ligand-gated Na+ channels
  • Na+ flows out of the cell via voltage-gated Na+ channels
  • Na+ flows into the cell via Na+ leak channels
  • Na+ channels are inactivated stopping the flow of Na+ through voltage-gated Na+ channels
  • No movement as the Na+ channels become reset and the gates close

Na+ Repolarization:

  • Na+ flows into the cell via voltage-gated Na+ channels
  • Na+ flows out of the cell via the ligand-gated Na+ channels
  • Na+ flows into the cell via Na+ leak channels
  • Na+ flows out of the cell via voltage-gated Na+ channels
  • Na+ channels are inactivated stopping the flow of Na+ through voltage-gated Na+ channels
  • No movement as the Na+ channels become reset and the gates close

Na+ Hyperpolarization:

  • Na+ flows into the cell via voltage-gated Na+ channels
  • Na+ flows out of the cell via the ligand-gated Na+ channels
  • Na+ flows into the cell via Na+ leak channels
  • Na+ flows out of the cell via voltage-gated Na+ channels
  • Na+ channels are inactivated stopping the flow of Na+ through voltage-gated Na+ channels
  • No movement as the Na+ channels become reset and the gates close

K+ Depolarization:

K+ flows out of the cell via voltage-gated K+ channels

K+ does not move via voltage-gated K+ channels as they are closed

K+ flows out of the cell via ligand-gated K+ channels

K+ flows into the cell via voltage-gated K+ channels

K+ flows into the cell via K+ leak channels

Excess K+ flows out of the cell due to slow closure of voltage-gated K+ channels

K+ Repolarisation: 

K+ flows out of the cell via voltage-gated K+ channels

K+ does not move via voltage-gated K+ channels as they are closed

K+ flows out of the cell via ligand-gated K+ channels

K+ flows into the cell via voltage-gated K+ channels

K+ flows into the cell via K+ leak channels

Excess K+ flows out of the cell due to slow closure of voltage-gated K+ channels

K+ Hyperpolarisation:

K+ flows out of the cell via voltage-gated K+ channels

K+ does not move via voltage-gated K+ channels as they are closed

K+ flows out of the cell via ligand-gated K+ channels

K+ flows into the cell via voltage-gated K+ channels

K+ flows into the cell via K+ leak channels

Excess K+ flows out of the cell due to slow closure of voltage-gated K+ channels

Reference no: EM131484775

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