Final answer:
The endomembrane system is the extensive system of membrane-enclosed cavities within the cytoplasm of the cell. It includes organelles such as the endoplasmic reticulum, Golgi apparatus, and vesicles. The endoplasmic reticulum is a network of channels that transport, synthesize, and store materials in the cell.
Step-by-step explanation:
The endomembrane system is the extensive system of membrane-enclosed cavities within the cytoplasm of the cell. It includes organelles such as the endoplasmic reticulum, Golgi apparatus, and vesicles, which work together to produce, package, and export cellular products. The endoplasmic reticulum, in particular, is a network of channels that transport, synthesize, and store materials in the cell.