Neuron Action Potential Quiz

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What is the resting potential of a neurone?

The process of generating a nerve impulse

The flow of sodium and potassium ions through the membrane

The difference in electrical charge between the inside and outside of a neurone (correct)

The transportation of neurotransmitters between neurons

What does polarisation refer to in the context of a neurone?

A difference in electrical charge between the inside and outside of the cell (correct)

The resting potential

The flow of uncharged chemicals through channels

The transportation of neurotransmitters

What is the function of the sodium-potassium pump?

Facilitating the flow of uncharged chemicals through channels

Generating nerve impulses

Transporting three sodium ions out of the cell and drawing two potassium ions in (correct)

Maintaining the resting potential

Which chemicals can freely cross through channels that are always open?

Oxygen, carbon dioxide, urea, and water Signup and view all the answers

What is the main reason for the negative charge inside the neurone?

Negatively charged proteins inside the cell Signup and view all the answers

When are the sodium and potassium channels closed in a resting neurone?

At rest Signup and view all the answers

What does selective permeability of the membrane mean?

Allowing some chemicals to pass more freely than others Signup and view all the answers

What causes the sodium and potassium channels to open and permit freer flow?

Stimulation Signup and view all the answers

What is the approximate concentration difference for sodium ions between inside and outside the membrane?

More than 10 times concentrated outside Signup and view all the answers

What is responsible for maintaining an electrical gradient during rest?

Sodium-potassium pump Signup and view all the answers

What is the function of selective permeability in the context of the neuron membrane?

Prevents sodium ions from leaking back into the cell Signup and view all the answers

Which two forces push sodium into the cell when the neuron is at rest?

Electrical gradient and concentration gradient Signup and view all the answers

What is the role of the concentration gradient in the movement of sodium ions?

Sodium is more concentrated outside than inside, making it more likely to enter the cell Signup and view all the answers

What are the competing forces that potassium is subject to?

Electrical gradient attracting it into the cell and concentration gradient driving it out of the cell Signup and view all the answers

What do the almost completely closed potassium channels permit?

A small amount of potassium flow, more outward than inward Signup and view all the answers

What continues pulling potassium back into the cell?

The sodium-potassium pump Signup and view all the answers

What prevents sodium ions from rapidly entering the cell despite being more concentrated outside than inside?

Closed sodium channels Signup and view all the answers

Why can't potassium enter the cell rapidly despite being attracted by the electrical gradient?

Almost completely closed potassium channels Signup and view all the answers

Neuron Action Potential Quiz

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