|| Action potential
|| Graded potential
||It is the electrical potential change that occurs when impulse transmits along the membrane of the nerve or muscle cell.
||It is the membrane potential that can vary in amplitude.
||Related with long distance signal.
||Related with short distance signal.
||Occurs in two phases i.e., depolarization and repolarization.
||Occurs in one phase either depolarization or hyperpolarization.
||All-or-none law obeyed.
||All-or-none law not obeyed.
||There is no possibility of summation.
||There is possibility of summation.
||Refractory period is present.
||Refractory period is not present.
||Ligand-gated ion channels generate action potential.
||Voltage-gated ion channels generate graded potential.
||Chance of losing its strength during transmission.
||No chance of losing its strength during transmission.
||Occurrence takes in excitable membranes only of specialized cells like neuron and muscles.
||Occurrence takes in most plasma membrane.
||Before action potential initiates, depolarization to threshold level most occur.
||There is no threshold level.
||Occurs for 1-2msec.
||Occurs for few milliseconds to seconds.
||Ions involved are mostly Na+, Cl– or K+.
||Ions involved are Na+ and K+.
||Large amplitude of -100mV.
||Amplitude is generally small (a few mV to tens of mV).
||In neuron segment, occurs in axon.
||In neuron segment, occurs in dendrites and cell body.
Image source: quora
Differences between Action potential and Graded potential