5 Questions
What is an action potential and where does it occur in a neuron?
An action potential is a rapid change from the resting potential at a specific place along the neuron. It occurs near the cell body of the neuron.
Explain the analogy of nerve signal propagation using the example of tipping dominoes.
The process of nerve signal propagation is likened to tipping the first of a row of standing dominoes. The first domino does not travel along the row but its fall is relayed to the end of the row, one domino at a time.
What are the changes that occur in the axon region as a nerve signal passes from left to right?
When the axon region has its first set of channels open, positive ions diffuse inward, and an action potential is generated. Then, the same region opens the second set of channels, allowing other positive ions to diffuse out of the axon.
How does a nerve signal start and how does it function as a long-distance signal?
A nerve signal starts out as an action potential generated near the cell body of the neuron. To function as a long-distance signal, this local event must be passed along the neuron.
What is the role of positive ions in the generation and propagation of a nerve signal?
Positive ions diffuse inward when the first set of channels open, generating an action potential. Then, other positive ions diffuse out of the axon when the second set of channels open, aiding in the propagation of the nerve signal.
Test your knowledge of the propagation of nerve signals with this quiz. Explore how action potentials travel along neurons and the mechanisms involved in passing the signal from one neuron to another.
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