Which of the Following Is TRUE About the Concentration Gradient

question 37

Multiple Choice

Which of the following is TRUE about the concentration gradient of Na⁺ in a neuron at rest?

• A)It favors its movement into the cell at the resting membrane potential.
• B)It favors its movement out of the cell at the resting membrane potential.
• C)It is equal and opposite to the electrical potential acting on Na⁺ at the resting membrane potential.
• D)It is in the same direction as the diffusion potential due to the concentration gradient for K⁺.
• E)It favors movement of Na⁺ in the opposite direction as the electrical potential acting on Na⁺ at the resting membrane potential.

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Definitions:

Depolarization Phase

The initial phase of an action potential where the membrane potential becomes less negative.

Action Potential

A rapid, temporary change in the electrical charge across a cell membrane, leading to the transmission of nerve impulses.

Repolarization Phase

The process during which cells return to their resting negative charge following depolarization.

H Zone

The region within a striated muscle fiber's sarcomere that contains only thick filaments and diminishes during muscle contraction.