Which of the following occurs during depolarization of a cardiac cell?
A) Sodium moves out of the cell.
B) The cell becomes relatively more positively charged.
C) Potassium moves into the cell.
D) The cell becomes negatively charged.

Question

Quizplus · Accepted Answer

During depolarization of a cardiac cell, there is a rapid influx of sodium ions into the cell, causing the membrane potential to become more positive. This is why choice B is correct. Choice A is incorrect because sodium moves into the cell during depolarization, not out. Choice C is incorrect because potassium moves out of the cell during repolarization, not into the cell. Choice D is incorrect because the cell becomes more positively charged, not negatively charged during depolarization.

Which of the Following Occurs During Depolarization of a Cardiac