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character: Cell Membrane Functions
topic: The cell membrane serves as a barrier that regulates the entry and exit of substances, maintains homeostasis, and facilitates communication between cells through receptors.
topic: Tight junctions prevent the leakage of substances between adjacent cells, ensuring that materials must pass through cells rather than between them, contributing to the selective permeability of tissues.
topic: Gap junctions allow for direct communication between adjacent cells by forming channels that permit the transfer of ions and small molecules, facilitating coordinated cellular responses.
topic: Desmosomes provide mechanical stability to tissues by anchoring adjacent cells together, helping to withstand stretching and shear forces, particularly in tissues like skin and heart.