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What is a graded potential?
A small, local change in membrane potential
Where do graded potentials occur?
In dendrites and cell body
What determines the strength of a graded potential?
The strength of the stimulus
What is threshold?
The minimum stimulus needed to trigger an action potential
What is the typical threshold value?
About -55 mV
Can graded potentials trigger action potentials?
Yes, if they reach threshold
What happens if threshold is not reached?
No action potential occurs
What happens if threshold is reached?
A full action potential is triggered
What does all-or-none mean?
A full action potential occurs or none at all