* Endoplasmic Reticulum (ER): This network of interconnected membranes acts as a highway system for transporting molecules within the cell. There are two main types:
* Rough ER: Studded with ribosomes, it synthesizes and transports proteins.
* Smooth ER: Lacks ribosomes, and is involved in lipid metabolism, detoxification, and calcium storage.
* Golgi Apparatus: This stack of flattened membrane-bound sacs receives proteins and lipids from the ER, modifies them, and packages them into vesicles for transport to other parts of the cell or for secretion outside the cell.
* Vesicles: Small membrane-bound sacs that bud off from the ER and Golgi apparatus. They transport various substances, including proteins, lipids, and waste products, throughout the cell.
Additionally, although not directly involved in transport, the cytoskeleton provides a framework for the movement of organelles and vesicles within the cell.
It's important to note that other organelles, like mitochondria and lysosomes, also play a role in transporting specific substances within the cell, but their primary functions lie elsewhere.
