Action Potentials Travel Down Axons Because _______

Action potentials travel down axons because _______.

A) sensory signals stimulate axons at many points along their lengths
B) potassium moves rapidly down the length of the axon,triggering action potentials as it does so
C) sodium moves rapidly down the length of the axon,triggering action potentials as it does so
D) positive sodium ions entering the neuron at one spot trigger an action potential at a neighboring spot on the membrane
E) positive potassium ions entering the neuron at one spot trigger an action potential at a neighboring spot on the membrane