18 Questions
What is the resting potential of a neurone?
The difference in electrical charge between the inside and outside of a neurone
What does polarisation refer to in the context of a neurone?
A difference in electrical charge between the inside and outside of the cell
What is the function of the sodium-potassium pump?
Transporting three sodium ions out of the cell and drawing two potassium ions in
Which chemicals can freely cross through channels that are always open?
Oxygen, carbon dioxide, urea, and water
What is the main reason for the negative charge inside the neurone?
Negatively charged proteins inside the cell
When are the sodium and potassium channels closed in a resting neurone?
At rest
What does selective permeability of the membrane mean?
Allowing some chemicals to pass more freely than others
What causes the sodium and potassium channels to open and permit freer flow?
Stimulation
What is the approximate concentration difference for sodium ions between inside and outside the membrane?
More than 10 times concentrated outside
What is responsible for maintaining an electrical gradient during rest?
Sodium-potassium pump
What is the function of selective permeability in the context of the neuron membrane?
Prevents sodium ions from leaking back into the cell
Which two forces push sodium into the cell when the neuron is at rest?
Electrical gradient and concentration gradient
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
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
What do the almost completely closed potassium channels permit?
A small amount of potassium flow, more outward than inward
What continues pulling potassium back into the cell?
The sodium-potassium pump
What prevents sodium ions from rapidly entering the cell despite being more concentrated outside than inside?
Closed sodium channels
Why can't potassium enter the cell rapidly despite being attracted by the electrical gradient?
Almost completely closed potassium channels
Test your knowledge about nerve impulse generation, information transportation between neurons, and the role of neurotransmitters. This quiz covers topics like resting potential and the generation of nerve impulses.
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