To explain:
Saltatory conduction propagates action potential more rapidly than contiguous conduction.
Introduction:
An action potential is a short, quick, large (100 mV) membrane potential change, during which the potential is reversed to make the inner cell more positive than the exterior. The axon hillock is the trigger area for the neuron because it is the site where the action potential is activated or initiated by a sufficiently large graded potential. When the axon hillock initiates an action potential, the rest of the nerve fiber is not activated by any more triggering effect. The impulse is carried out automatically throughout the neuron by one of two modes of transmission: adjacent conduction and saltatory conduction, without further stimulus.
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Human Physiology: From Cells to Systems (MindTap Course List)
- Define an action potential.arrow_forwardConformational changes in channel proteins brought about by voltage changes are responsible for opening and closing Na+ and K+ gates during the generation of an action potential. (True or false?)arrow_forwardDraw and label an action potential, indicating the ion movements responsible for the rising phase and the falling phase.arrow_forward
- Explain how action potentials are generated and propagated along neurons.arrow_forwardConstruct a personalized flow chart and show the summary of the events involved for the propagation of action potential along the neuron. Highlight the role being played by ions.arrow_forwardDescribe the events of an action potential in terms of ions and gates or channels beginning with the generation of a local potential through the re-establishment of resting membrane potential.arrow_forward
- Describe the difference between graded and action potentials.arrow_forwardIn the figure to the left, name the 4 phases of the action potential (Note: you have to write in where phase 4 occurs). Describe what happens in each phase with a focus on Na+ and K+ flow through channels and the membrane potential. Discuss the importance of threshold. How does this relate to the concept of APs being all or none?arrow_forwardWhat would occur if voltage - regulated Na+ and k+ gates opened at the same time rather than at different times, during the production of an action potential?arrow_forward
- Define saltatory conduction and explain how it differs from continuous conduction.arrow_forwardIs an action potential more or less likely under these conditions? Explain.arrow_forwardExplain how an action potential is propagated down an axon in continuous conduction. Why is saltatory conduction faster than continuous conduction?arrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage LearningHuman Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning