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Neuron Nerve Signals Quiz

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Questions and Answers

What is the main function of the sodium-potassium pump in neurons?

Initiate action potentials

Maintain the resting potential of the neuron (correct)

Transport sodium ions into the neuron

Promote depolarization of the axon

What happens if the threshold voltage for an action potential is never reached in a neuron?

The action potential occurs repeatedly

The neuron becomes hyperpolarized

The threshold voltage decreases

The action potential does not occur (correct)

Why is the change in charge inside the axon from negative to positive called depolarization?

Resulting from the influx of positively charged sodium ions (correct)

Due to the exit of potassium ions from the neuron

As a signal for the initiation of action potentials

Following the opening of sodium protein channels

What is the significance of repolarization in neuronal action potentials?

It marks the end of an action potential Signup and view all the answers

How does increasing the strength of a stimulus affect action potentials in neurons?

It may cause more action potentials to occur in a given period Signup and view all the answers

Why does a resting neuron have potential energy similar to a fully charged battery?

Because of the presence of large, negatively charged proteins inside the cell and positively charged sodium ions outside. Signup and view all the answers

Why is the voltage measurement of a nerve cell's resting potential always a negative number?

Due to the presence of large, negatively charged proteins inside the cell and positively charged sodium ions outside. Signup and view all the answers

What contributes to the positive charge inside a resting neuron?

Negative proteins and other large molecules stuck inside the cell. Signup and view all the answers

What causes the outside of a cell to be positively charged in a resting neuron?

Positively charged sodium ions gathering around the outside of the cell membrane. Signup and view all the answers

How is a neuron's resting potential energy comparable to that of a battery?

As a result of the negative voltage measurement when comparing inside and outside charges. Signup and view all the answers