nerve impuse

• step 1 ?


  • stimulation of cell occurs
  • allow Na in cell
  • reach threshold of -55mv -> more Na rush in
• what happens after more Na rushes in ?

  inside cell = more positive to outside as rapid depolarisation occurs

  • Na gates close, K gates open
• what happens after Na gates close and K gates open?

  K diffuse out of cell

  • cells inside more negative as neuron repolarises
  • hyperpolarisation occurs
  • Na-K pump activates
• what does Na-K pump do?

  transport Na out of cell; K in cell

  • restores resting membrane potential