Final answer:
The plasma membrane and the basement membrane are responsible for structural support in tissues and act as permeability barriers, regulating the movement of substances and contributing to various cell functions.
Step-by-step explanation:
The plasma membrane and the basement membrane (also known as the basal lamina) serve as structural support in tissue organization and as permeability barriers. The plasma membrane, a fluid bilayer made of different lipid molecules, controls the passage of substances in and out of the cells. It plays a critical role in cell adhesion, signaling, and the attachment surface for the cytoskeleton. The basement membrane provides strength and flexibility, and it is uniquely permeable, allowing certain materials to pass through.
In addition to the plasma membrane and basement membrane, tight junctions also contribute to tissue organization by forming an impermeable barrier between cells. Moreover, the cytoskeleton plays an essential part in maintaining cell shape, securing organelles, and enabling cellular movement.