nerve transmissions - depolarisation

• when is action potential generated


  when a nerve impulse is initiated
• what is the value for action potential


  +40mv
• what happens when a stimulus excites a neurone


  it becomes depolarised
• how long will action potential last when generated by depolarisation


  3 milliseconds
• what is the result of the membrane becoming depolarised


  it will result in an action potential
• during depolarisation what happens to the Na+ vote-gated channel


  it opens and Na+ ions rapidly diffuse
• What causes Na+ channels to open?


  the energy from a stimulus
• what happens in the membrane when the sodium ions rapidly diffuse into the axon


  it becomes depolarised
• during depolarisation what happens to the volt-gated k+ channels


  they close
• what happens when threshold voltage is reached


  the permeability of the membrane to Na+ increases
• what is the value of threshold potential


  -50mV
• what must reach threshold potential in order to reach action potential


  the stimulus
• what would happen if our body would react to all stimuli


  our body would constantly be changing levels