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The primary role of cytoplasm is to make up the interior of the cell, providing a medium in which various cellular processes can occur. It encompasses everything inside the cell membrane, excluding the nucleus, and contains organelles, cytoskeletal elements, and the cytosol, which is the fluid portion. The cytoplasm plays a crucial role in maintaining the cell's shape, allowing the movement of materials around the cell, and facilitating cellular processes such as metabolic reactions.

This context is vital for understanding cellular function, as the cytoplasm is not only a structural component but also a dynamic environment that supports a multitude of biochemical activities essential for life.