👉 The fluid division, also known as the fluid membrane or plasma membrane, is a semi-permeable barrier that surrounds and separates cells from their external environment in living organisms. It is composed primarily of a lipid bilayer, with proteins embedded within or attached to its surface, allowing it to regulate the passage of substances in and out of the cell. This dynamic structure enables selective permeability, maintaining cellular homeostasis by controlling the entry and exit of ions, nutrients, waste products, and signaling molecules. The fluid nature of this membrane permits the cell to adapt to changing conditions, facilitating processes like endocytosis and exocytosis.
