Membrane Potential Flashcards
Receptor potential is _____.
graded
Synaptic potential is _____.
graded
Action potential follows the _____ rule.
all-or-none
Ions involved in neuronal excitablity
Sodium
Chloride
Potassium
Membrane proteins regulate flux of _____ into and out of the cell
ions
Ion transporters create and actively move ions against the _____.
concentration gradient
Ion channels allow ions to diffuse down the _____ and cause _____ to certain ions.
concentration gradient
selective permeability
Reversal or equilibrium potential The movement of K+ stops when _____ equals _____.
the electrical force repelling K+
the force of the concentration gradient
The Nernst equation predicts _____.
the voltage created by diffusion of a single ion type
Conductance is a measure of the _____.
permeability of an ion
Contribution of various ions to the resting potential depends on their _____ and their _____.
equilibrium potential
conductance
Goldman equation describes equilibrium in an environment with _____, and takes into account the _____ of each ion.
more than one ion relative permeability (P)
For any given ion its distribution across the membrane is determined by:
- _____
- _____
- _____
The chemical gradient
The electrical gradient
Permeability (conductance)
Maintaining the resting membrane potential is a(n) _____.
active process
i.e. requires energy
Cells maintain gradients actively with the _____.
Na+/K+ ATPase
sodium-potassium pump
