What term describes the network of protein filaments and tubules in the cytoplasm?

The term that describes the network of protein filaments and tubules in the cytoplasm is the cytoskeleton. The cytoskeleton is a dynamic structure that provides shape and support to the cell, facilitating movement and transport within the cell. It is composed of three main types of fibers: microfilaments, intermediate filaments, and microtubules, each serving distinct roles in maintaining cellular integrity, enabling intracellular transport, and assisting in cell division.

In contrast, the extracellular matrix refers to the complex network outside of the cell, providing structural and biochemical support to surrounding cells. The cytoplasm itself is the gel-like substance within the cell where organelles are suspended but does not specifically refer to the protein filaments and tubules. The cell membrane, another distinct structure, surrounds the cell and acts as a barrier regulating the movement of substances in and out of the cell. Each of these components plays a crucial role in cell function, but the cytoskeleton uniquely represents the internal framework that shapes and supports the cell's structure.