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Neuron Action Potential

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Questions and Answers

What is the sequence of events during an action potential in a neuron?

First gate opens, charge is reversed; second gate opens, charge is reversed; first gate remains open, charge stays reversed

First gate opens, charge is reversed; second gate opens, charge is reversed; first gate closes, charge stays reversed

First gate opens, charge is reversed; second gate opens, charge is reversed; first gate closes, charge returns to rest (correct)

First gate opens, charge is reversed; second gate remains closed, charge returns to rest

Why does a neuron fire if the stimulus is just strong enough to pass its threshold?

It opens all the gates in the neuron

It causes the neuron to add together 'fire' messages and 'don't fire' messages (correct)

It reverses the electrical charge in the neuron

It prevents the neuron from firing

How does a neuron fire according to the 'all or none' policy?

It fires gradually, increasing in strength

It fires partially at varying strengths

It fires randomly at different strengths

It either fires at full strength or not at all (correct)

What happens when a neuron fires in an 'all or none' fashion?

It fires at full strength or not at all Signup and view all the answers

What role do 'fire' messages and 'don't fire' messages play in a neuron's firing decision?

'Fire' messages increase membrane potential, 'don't fire' messages decrease membrane potential Signup and view all the answers

How does a neuron determine whether it will fire or not based on incoming signals?

By adding 'fire' messages and subtracting 'don't fire' messages Signup and view all the answers

In what way does a neuron behave similarly to turning on a light switch?

Neurons are either fully firing or not firing at all like a light switch Signup and view all the answers

What happens to the electrical charge in a neuron after the first gate opens and closes?

The charge returns to what it was when the neuron was at rest Signup and view all the answers

What determines whether a neuron will cross its firing threshold?

'Fire' messages being greater than 'don't fire' messages Signup and view all the answers

How does a neuron determine whether a signal is strong enough to make it fire?

By summing up the effects of 'fire' and 'don't fire' messages from all signals received Signup and view all the answers

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.