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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.
Electrochemical events in the cell body summate in the axon hillock, and the effects are directly passed to the attached axon. If an action potential is generated, the axon conducts it away from the cell body. The axon attaches directly to the dendrites in many neurons. In this arrangement, the axon conducts action potentials toward the cell body.