Which of the following situations occurs in electrically excitable cells?

A) When Na⁺ channels open, K⁺ channels close.
B) The sodium-potassium pump moves Na⁺ into the cell.
C) Depolarization causes voltage-gated Na⁺ channels to open.
D) Ligand-gated Na⁺ channels are opened by high extracellular Ca²⁺ levels.
E) Proteins tend to diffuse out of the cell.

Electrically Excitable Cells

Cells that can change their membrane potential in response to a stimulus, leading to generation and propagation of action potentials.

Depolarization

A reduction in the difference in electrical charge across a cell's plasma membrane, which is a crucial step in the conduction of impulses along nerve cells.

Voltage-Gated

Ion channels that open or close in response to changes in membrane potential, playing key roles in the transmission of neural impulses.