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Questions and Answers
What is the sequence of events during an action potential in a neuron?
Why does a neuron fire if the stimulus is just strong enough to pass its threshold?
How does a neuron fire according to the 'all or none' policy?
What happens when a neuron fires in an 'all or none' fashion?
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What role do 'fire' messages and 'don't fire' messages play in a neuron's firing decision?
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How does a neuron determine whether it will fire or not based on incoming signals?
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In what way does a neuron behave similarly to turning on a light switch?
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What happens to the electrical charge in a neuron after the first gate opens and closes?
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What determines whether a neuron will cross its firing threshold?
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How does a neuron determine whether a signal is strong enough to make it fire?
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Study Notes
Neuron Stimulation
- When a cell is stimulated, the first gate opens, and the electrical charge is reversed.
- The next gate opens, and the charge is reversed, but the first gate closes, and the charge returns to its resting state.
Action Potential
- The action potential is the sequence of gates opening along the length of the cell.
Graded Potential
- Neurons have a threshold for firing, which requires a stimulus strong enough to pass it.
- The neuron receives many signals from other neurons, some of which cause the neuron to fire (excitatory) and others that prevent it from firing (inhibitory).
- The neuron constantly adds the excitatory signals and subtracts the inhibitory signals.
- If the excitatory signals are strong enough, the threshold is crossed, and the neuron fires.
All or None Policy
- When a neuron fires, it fires in an all or none fashion, with no partial firing.
- Neurons are either firing at full strength or not firing at all.
- This is similar to a light switch, which is either on or off, with no intermediate state.
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Description
Test your knowledge on the action potential in neurons. Understand the sequence of events that occur when a neuron is stimulated and how it leads to firing. Explore how the strength of the stimulus affects the firing of a neuron.
