Which Is TRUE About Neuronal Membrane Electrical and Concentration Gradients

question 25

Multiple Choice

Which is TRUE about neuronal membrane electrical and concentration gradients at the peak of the action potential?

• A)The electrical gradient is in a direction that would tend to move K⁺ out of the cell.
• B)The concentration gradient for K⁺ is in a direction that would tend to move it into the cell.
• C)The concentration gradient for K⁺ greatly increases compared to at rest.
• D)The concentration gradient for Na⁺ is in a direction that would tend to move it out of the cell.
• E)The electrical gradient for Na⁺ is in a direction that would tend to move it into the cell.

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Definitions:

Optic Disc

The point in the eye where the optic nerve fibers exit the retina, often referred to as the blind spot because it lacks light-sensitive cells.

Papilledema

Swelling of the optic disc due to increased intracranial pressure, often associated with symptoms like headaches and visual disturbances.

Night Vision

The ability to see in low-light conditions, often enhanced by technology in humans but naturally better in some animal species.