Endoplasmic reticulum is the passage in the cell.conduction of materials inside the cell takes place through this organelle........also known as cytoskeleton as it provides firmness and shape to the cell.

mitochondria: power house of the cell.helps in  the production and storage of energy.
       hope this may help you

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ENDOPLASMIC RETICULUM : A network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane.

CYTOSKELETON : The cytoskeleton is a series of intercellular proteins that help a cell with shape, support, and movement.

MITOCHONDRIA : It is a double membrane-bound organelle found in most eukaryotic cells
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