Which term describes an extensive network of tubes, sacs, and vesicles throughout a cell that provides transport as its main function?

The endoplasmic reticulum is an extensive network of membranes arranged as tubes, sacs, and vesicles throughout the cell. It helps transport materials within the cell, so the correct choice is endoplasmic reticulum. The cell membrane surrounds the cell, the cell wall provides support, and centrioles help organize cell division.

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