ion permeability

Ion permeability refers to how easily ions—charged particles like sodium, potassium, calcium, and chloride—can pass through a cell's membrane. Cell membranes act as barriers, but they contain specialized channels or pores that allow specific ions to enter or exit, depending on the body's needs. This movement is essential for many functions, including nerve signaling, muscle contractions, and maintaining the body's fluid balance. The degree of permeability varies for different ions and can change in response to signals or conditions, helping regulate the cell's activity and overall health.