* Support: The cell membrane acts as a barrier, maintaining the cell's shape and integrity. It provides structural support by holding the cell's contents together.
* Protection: The cell membrane acts as a selective barrier, regulating what enters and exits the cell. This protects the cell from harmful substances and helps maintain a stable internal environment.
Other structures that contribute to cell support and protection include:
* Cell Wall (in plant cells): A rigid outer layer that provides additional support and protection, allowing plant cells to withstand turgor pressure.
* Cytoskeleton: A network of protein filaments that provides structural support, helps maintain cell shape, and enables movement within the cell.
* Extracellular Matrix (ECM): A complex network of proteins and carbohydrates that surrounds cells in multicellular organisms, providing structural support, facilitating cell-cell communication, and regulating cell behavior.
While each of these structures plays a role in cell support and protection, the cell membrane is the most fundamental and crucial structure for these functions.
