Encyclopedia of Animal Cognition and Behavior

Living Edition
| Editors: Jennifer Vonk, Todd Shackelford

Action Potentials

  • Natalia PrietoEmail author
  • Joseph Wrobleski
Living reference work entry

Latest version View entry history

DOI: https://doi.org/10.1007/978-3-319-47829-6_1268-2

Synonyms

Definition

An action potential is a brief event that occurs when there is a change in the membrane potential, or electrical activity, of a neuron.

Introduction

Action potentials play an integral part of communication between neurons and are involved in many processes within the central nervous system, neuromuscular junctions, and cardiac functions. They occur in response to a stimulus, such as sensory input or neurotransmitters, usually through the dendrites of the neuron. These stimuli cause small excitations in the dendrites or cell body called graded potentials. Graded potentials are summated and must be strong enough to trigger the impulse. At rest, the inside of a neuron is negative relative to the outside. Once it is stimulated, the intracellular environment becomes positive relative to the outside of the cell, thus allowing ion channels to open and sodium (Na+) to move into the axon. Most neurons have a protein called myelin that surrounds segments of...

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References

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Hofstra UniversityHempsteadUSA

Section editors and affiliations

  • Oskar Pineno
    • 1
  1. 1.Hofstra UniversityLong IslandUSA