Resting Membrane Potential
Graded Potential
Action Potential
Action Potential Propagation
1
2
3
Extracellular fluid
Cytoplasm
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Membrane potential (mV)
Value is outside graph range
1
mV
2
mV
3
mV
Na+
K+
Na+ channel
K+ channel
Na+– K+ pump
Excitatory
ligand-gated
channel
Inhibitory
ligand-gated
channel
Voltage-gated
Na+ channel
Voltage-gated
K+ channel
Close Channel Key
Close Info