Action potentials are initiated when a stimulus depolarizes the cell membrane past a certain threshold, triggering sodium ion channel opening. Receptor potentials are graded potentials influenced by stimulus strength.
Threshold: Level of depolarization the membrane potential has to surpass for the action potential to start.
Action potentials are formed when a stimulus causes the cell membrane to depolarize past the threshold of excitation, causing all sodium ion channels to open.
Receptor potentials are classified as graded potentials, and the magnitude of these potentials depends on the strength of the stimulus.
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