Permeable Membrane

A permeable membrane is a barrier that allows certain substances to pass through while blocking others. Think of it like a filter that selectively lets molecules like water, oxygen, or nutrients move in or out, depending on their size or properties. This selective permeability is essential in biological systems, such as cell membranes, where it helps regulate the movement of materials to maintain proper function and balance. The membrane's design ensures that necessary substances can enter or exit, while waste or harmful particles are kept out.