Action Potential Flashcards
what is depolarisation and repolarisation caused by
two sets of voltage gated channels
why do cells sit at RMP
due to potassium leak
when will a cell exit the rmp
when something depolarises it
what is the mV of the cell during RMP
-70mV
during depolarisation what happens to sodium
sodium flows in towards its equilibrium potential however sodium channels do not stay open for long
what is the mV of the cell during depolarisation
+40mV
what does the initial depolarisation do
slowly open another set of voltage gated potassium channels
what happens after initial depolarisation opens another set of potassium channels
they let out potassium and rapidly hyperpolarise the cell
what happens due to so much potassium flooding out
takes it past -70mV and hyperpolarises it in the overshoot
what is the mV of the cell during repolarisation
-90mV
how does the cell return to the RMP
when both sets of voltage dependent channels shut
what is the mV of the cell once it has returned to the RMP
-70mV
