semi-permeability

Semi-permeability refers to a property of a membrane that allows certain substances to pass through while blocking others. Think of it as a selective gatekeeper—permitting small molecules or specific chemicals to move freely, while restricting larger or unwanted particles. This mechanism is essential in biological systems, such as cell membranes, where it helps maintain the cell's internal environment, control nutrient intake, and waste removal. The selective nature ensures proper function and balance within organisms, making semi-permeability a crucial factor in processes like osmosis and diffusion.