Graded Potential vs Action Potential

graded potential: type of signal

input signal

graded potential: occurs where

usually dendrites and cell body

graded potential: types of gated ion channels involved

mechanically, chemically, or voltage gated channels

graded potential: ions involved

usually Na+, Cl-, Ca2+

graded potential: type of signal

input signal

depolarizing (Na+) or hyperpolarizing (Cl-)

graded potential: strength of signal

depends on initial stimulus, can be summed

graded potential: what initiates the signal

entry of ions through gated channels

graded potential: unique characteristics

-no minimum level required to initiate

-two signals coming close together in time will sum

-initial stimulus strength is indicated by frequency of a series of action potentials

action potential: type of signal

regenerating conduction signal

action potential: occurs where

trigger zone through axon (axon hillock)

action potential: types of gated ion channels involved

voltage-gated channels

action potential: ions involved

Na+ and K+

action potential: type of signal

depolarizing

action potential: strength of signal

all or none phenomenon; cannot be summed

action potential: what initiates signal

above threshold graded potential at the trigger zone opens ion channels

action potential: unique characteristics

- threshold stimulus required to initiate

- refractory period: two signals too close together in time cannot sum