Podcast
Questions and Answers
What is the resting potential of a neurone?
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?
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?
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?
Which chemicals can freely cross through channels that are always open?
What is the main reason for the negative charge inside the neurone?
What is the main reason for the negative charge inside the neurone?
When are the sodium and potassium channels closed in a resting neurone?
When are the sodium and potassium channels closed in a resting neurone?
What does selective permeability of the membrane mean?
What does selective permeability of the membrane mean?
What causes the sodium and potassium channels to open and permit freer flow?
What causes the sodium and potassium channels to open and permit freer flow?
What is the approximate concentration difference for sodium ions between inside and outside the membrane?
What is the approximate concentration difference for sodium ions between inside and outside the membrane?
What is responsible for maintaining an electrical gradient during rest?
What is responsible for maintaining an electrical gradient during rest?
What is the function of selective permeability in the context of the neuron membrane?
What is the function of selective permeability in the context of the neuron membrane?
Which two forces push sodium into the cell when the neuron is at rest?
Which two forces push sodium into the cell when the neuron is at rest?
What is the role of the concentration gradient in the movement of sodium ions?
What is the role of the concentration gradient in the movement of sodium ions?
What are the competing forces that potassium is subject to?
What are the competing forces that potassium is subject to?
What do the almost completely closed potassium channels permit?
What do the almost completely closed potassium channels permit?
What continues pulling potassium back into the cell?
What continues pulling potassium back into the cell?
What prevents sodium ions from rapidly entering the cell despite being more concentrated outside than inside?
What prevents sodium ions from rapidly entering the cell despite being more concentrated outside than inside?
Why can't potassium enter the cell rapidly despite being attracted by the electrical gradient?
Why can't potassium enter the cell rapidly despite being attracted by the electrical gradient?
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