potentials Flashcards
(5 cards)
what are the different kinds of membrane potential and when are they used?
Action potentials: transmit signals over long distances
Graded potentials: Decide when an action potential should be fired
Resting membrane potentials:
Keep cells ready to respond
The resting membrane potential definition
the electrical charge difference across a cell membrane when it’s at rest
outside 0mv and inside is negative relative to that
how does the sodium-potassium pump contribute to the ionic basis of the resting membrane potential?
Contributes about 5mV
Protein actively transports :
3 NA+ OUT
2 K+ IN
how does the Selective permeability of the membrane contribute to the ionic basis of the resting membrane potential?
allows certain ions to pass through:
At rest, potassium ions have greater permeability than sodium ions due to more open potassium channels
so
what is the
