Action potentials from different axons differ in amplitude. What does the amplitude predict about the axon's...
Action potentials from different axons differ in amplitude. What does the amplitude predict about the axon's diameter and why?
Homework Answers
Amplitude predicts the axon's diameter.This is related to the interior resistance offered to the flow of current with change in axon diameter. Axons with less diameter produce action potentials with low amplitude and vice versa.This is because axons with small diameter result in more resistance to the flow of current while axons will large diameter results in less resistance to the flow of current.Therefore, in axons with less diameter the flow of Na+ is restricted and it takes more time to accumulate more positive charges and reach threshold at the next segment to evoke an action potential.The opposite happens in axons with larger diameter where resistance being small, Na+ move faster from one axon segment to the other ,reach a threshold quickly and action potential is generated fast.We can conclude that a greater amplitude indicates larger axon's diameter while a lesser amplitude indicates lesser axon diameter.
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