Movement of materials to different parts of cytoplasm and nucleus is generally carried out by

The movement of materials to different parts of the cytoplasm and the nucleus is primarily carried out by the endoplasmic reticulum (ER). The ER is a complex network of membranes that provides passages throughout much of the cell, functioning specifically in the transport, synthesis, and storage of materials. It acts as an intracellular highway, facilitating the trafficking of proteins and lipids between various cellular compartments, including the nucleus. While other organelles have specialized roles—ribosomes for protein synthesis, mitochondria for energy production in the form of ATP, and lysosomes for digestion and waste removal —the ER is uniquely structured to serve as a distribution network. It is part of the endomembrane system, which works together to produce, modify, and transport essential substances within the eukaryotic cell.