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13 Cards in this Set

  • Front
  • Back
action potential
The electrical signal conducted along axons (or muscle fibers) by which information is conveyed from one place to another in the nervous system.
depolarization
Displacement of a cell’s membrane potential toward a less negative value.
electrochemical equilibrium
The condition in which no net ionic flux occurs across a membrane because ion concentration gradients and opposing transmembrane potentials are in exact balance.
equilibrium potential
The membrane potential at which a given ion is in electrochemical equilibrium.
hyperpolarization
The displacement of a cell’s membrane potential toward a more negative value.
ion channels
Integral membrane proteins possessing pores that allow certain ions to diffuse across cell membranes, thereby conferring selective ionic permeability.
Nernst equation
A mathematical relationship that predicts the equilibrium potential across a membrane that is permeable to only one ion.
overshoot
The peak, positive-going phase of an action potential, caused by high membrane permeability to a cation such as Na+ or Ca2+.
receptor potential
The membrane potential change elicited in receptor neurons during sensory transduction.
resting potential
The inside-negative electrical potential that is normally recorded across all cell membranes.
rising phase
The initial, depolarizing phase of an action potential, caused by the regenerative, voltage-dependent influx of a cation such as Na+ or Ca2+.
threshold
The level of membrane potential at which an action potential is generated.
undershoot
The final, hyperpolarizing phase of an action potential, typically caused by the voltage-dependent efflux of a cation such as K+.