Action potential (ms mV)

abigail8900
Mind Map by abigail8900, updated more than 1 year ago
abigail8900
Created by abigail8900 over 7 years ago
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Description

A2 Biology Mind Map on Action potential (ms mV), created by abigail8900 on 09/30/2013.

Resource summary

Action potential (ms mV)
  1. Resting potential/ polarised
    1. ATP pump, 2K+in, 3Na+out
      1. -60mV potential difference inside membrane compared to outside membrane means it is polarised
        1. More permeable to K+ than Na+
          1. Kinetic E. opens Na+ channels
            1. Na+ floods in down electrochemical gradient, converting it to electrical E.
              1. If it reaches -50mV (threshold potential) then will go to depolarisation
              2. (Na+ and K+ gated channels were both closed before)
              3. (net - inside, net + outside)
                1. K+channels open, K+ going out
                2. Depolarisation
                  1. ATP pump, 2K+in, 3Na+out
                    1. K+channels open, K+ going out
                      1. +40mV potential difference inside membrane compared to outside membrane means it is depolarised
                        1. (net + inside, net - outside)
                        2. Repolarisation
                          1. ATP pump, 2K+in, 3Na+out
                            1. K+channels open, K+ going out
                              1. K+ gated channels open, K+ flows out down electrochemical gradient
                                1. More flows out than needed meaning it becomes hyperpolarised
                              2. Hyperpolarisation
                                1. ATP pump, 2K+in, 3Na+out, and permeability starts to restore balance
                                  1. (Not able to register any more pain until back to resting potential)
                                  2. K+channels open, K+ going out
                                    1. K+ gated channels close
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