Which is true of an action potential?
A) The plasma membrane is impermeable to Na+ and K+ ions.
B) Na+ ions move extracellularly.
C) The charges become equal on the outside and inside of the plasma membrane.
D) The outside of the plasma membrane is negatively charged, and the inside is positively charged.

Question

Quizplus · Accepted Answer

During an action potential, the plasma membrane becomes permeable to Na+ and K+ ions. Na+ ions move intracellularly, causing the outside of the plasma membrane to become positively charged, while K+ ions move extracellularly, leading to the inside of the membrane becoming negatively charged. This results in a reversal of the normal polarity of the plasma membrane, with the outside becoming positively charged and the inside negatively charged. Therefore, option D is the correct answer.

Which Is True of an Action Potential