Ion Channel

An ion channel is a protein structure embedded in a cell's membrane that acts like a selective gateway for ions—charged particles such as sodium, potassium, calcium, and chloride—to enter or exit the cell. These channels regulate the flow of ions, which is essential for functions like nerve signal transmission, muscle contraction, and maintaining the cell’s electrical balance. They can open or close in response to various signals, ensuring precise control over cellular activity and communication within the body.