biological membranes

Biological membranes are thin layers that separate the interior of cells and their organelles from the outside environment. They are made primarily of lipids and proteins, creating a flexible barrier that controls what enters and leaves. This selective permeability allows cells to maintain their internal balance, communicate with other cells, and carry out essential functions. Membranes also play crucial roles in processes like energy production and signaling. Overall, they are fundamental to the structure and function of all living organisms.