Question

why does depolarization occur?
multiple choice
more k⁺ diffuse into the cell than na⁺ diffuse out of it
more k⁺ diffuse out of the cell than na⁺ diffuse into it
more na⁺ diffuse into the cell than k⁺ diffuse out of it
more na⁺ diffuse out of the cell than k⁺ diffuse into it

Explanation:

Depolarization occurs when the membrane potential of a cell becomes less negative. This is due to the influx of positively - charged sodium ions ($Na^+$) into the cell. More $Na^+$ diffuse into the cell than $K^+$ diffuse out of it, changing the electrical charge across the cell membrane.

Answer:

More $Na^+$ diffuse into the cell than $K^+$ diffuse out of it