👉 Selective fluid refers to a specific type of fluid that is selectively permeable, meaning it allows certain molecules or ions to pass through while blocking others. This property is crucial in biological systems, particularly in cell membranes, where it helps regulate the internal environment by controlling the movement of substances like water, ions, and small molecules. For instance, in red blood cells, selective fluid allows oxygen to diffuse into the cell while keeping out larger molecules, ensuring efficient oxygen transport and maintaining cellular homeostasis. This selective permeability is essential for various physiological processes, including nutrient uptake, waste removal, and maintaining the correct osmotic balance within cells.
