resting potential Flashcards
what is the potential difference when a neuron is in its resting state
the inside is more negative and the outside is more positive
how can the membrane be described as being in its resting state
polarised
what is the resting potential
-70mv
what is the resting potential created and maintained by
sodium potassium pumps and potassium channels
how does the sodium potassium pump maintain a resting potential
use active transport (ATP) to move three Na+ ions out of the cell and two K+ ions into the cell via a carrier protein
how is a sodium electrochemical gradient established
the membrane isnt permeable to sodium ions so they cannot diffuse back in, creating an electrochemical gradient as there are more Na+ ions outside than inside
how does potassium channels regulate resting potential
allow facilitated diffusion out of the neuron down their concentration gradient after entering via the sodium potassium pump