Indicate whether the membrane is more permeable to K + or to Na + or is equally permeable to these ions under the stated conditions by writing the appropriate letter in the blank using the following answer code: -during the rising phase of an action potential A)The membrane is more permeable to K⁺ than to Na⁺. B)The membrane is more permeable to Na⁺ than to K⁺. C)The membrane is about equally permeable to Na⁺ and K⁺.

Question

Quizplus · Accepted Answer

During the rising phase of an action potential, the membrane is more permeable to Na⁺ than to K⁺. This is due to the activation of voltage-gated Na+ channels, which allow a large influx of Na+ ions into the cell, leading to depolarization and the initiation of the action potential. K+ channels are also present, but they open more slowly and contribute less to the rising phase of the action potential. Therefore, Na+ ions are more permeable than K+ ions during this phase.

Indicate Whether the Membrane Is More Permeable to K+ or to Na+

Indicate Whether the Membrane Is More Permeable to K⁺ or to Na⁺