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This positive spike constitutes the action potential: the electrical signal that typically moves from the cell body dlown the axon to the axon terminals. The electrical signal moves down the axon like a wave; at each 84 Ch apter 3 Biopsycholo gy point, some of the sodium ions that enter the cell diffuse to the neJ1.'t section of the axon, raising the charge past the threshold of excitation and triggering a new influx of sodium ions.
The action potential is. â¢ a wave of electricity that travels down the axon of neuron â¢ from the cell body to the axon terminals This wave of electricity is actually a brief change in the resting membrane potential of the neuron â¢ from -70mv to +35mv Then the membrane returns to its resting potential of -70mv. î î î. Briefly opening more membrane gates for Na+ and then for K+ â¢ Thus making the neuron cell membrane o More permeable first to Na+ o Then to K+ â¢ This causes a change in the numbers of plus charges inside and outside the cell membrane o Changing the cell membrane potential.