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briefly explain the distribution of ions in an axon during depolarization and repolarization.

briefly explain the distribution of ions in an axon during depolarization and
repolarization.
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Answer #1

in the resting state of a nerve cell,

  • The inside of the cell has more number of K+ ions and less Na+ ions
  • The outside contains more Na+ and less K+ ions
  • The cytosol also contains a high concentration of anions--phosphate ions and negatively charged proteins.

In case of depolarisation

  • The action potential occurs and the Na+ channels open.
  • There is a sudden influx of the sodium ions into the cytosol due to the concentration gradient
  • This causes a sudeen increase in the membrane potential.
  • The K+ concentration will be higher inside the cell

the potential increases and reaches a state in which the K+ channels are opened .The k+ ions move out of the cell and the membrane potential gradually drops.This is repolarisation

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