Q:

What is a cell's delivery system?

A:

Quick Answer

The cell's delivery system is called the endoplasmic reticulum. This structure is a system of tubules, sacs and membranes that may be interconnected. The endoplasmic reticulum is continuous with the membrane of the nucleus as well as the membrane surrounding the cell.

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Full Answer

Two types of endoplasmic reticulum exist in a cell: rough and smooth. Ribosomes, structures that make proteins, cling to the rough endoplasmic reticulum, giving it a lumpy appearance. The rough endoplasmic reticulum, or RER, consists mainly of disk-like sacs. The smooth endoplasmic reticulum, or SER, lacks ribosomes on its surface and is composed of mostly tubules.

The SER makes and transports lipids, or fats, out of the cell. The RER transfers proteins from the ribosomes to the outside of the cell or to another structure called the Golgi apparatus to be processed further.

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Related Questions

  • Q:

    In what structure of the mammalian cell are proteins synthesized?

    A:

    Proteins of the mammalian cell are synthesized on ribosomes that are either free in the cytosol or attached to the endoplasmic reticulum. Ribosomes suspended in the cytosol make proteins that function in the cytosol. Bound ribosomes make proteins that are included in the cell's membrane or exported from the cell.

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  • Q:

    What does the smooth endoplasmic reticulum do?

    A:

    The smooth endoplasmic reticulum, or smooth ER, performs functions in several metabolic processes, including synthesis of steroids, lipids and phospholipids, as well as the metabolism of carbohydrates, elimination of drugs from the system and attachment of receptors to cell membrane proteins. Both the smooth and rough endoplasmic reticulum form an organelle in eukaryotic organisms creating a network of tubes or sacs called cisternae, but it is the smooth endoplasmic reticulum that helps the body eliminate a number of toxins.

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    How is a cell like a city?

    A:

    A cell is like a city because it has walls, a transportation system, streets, a recycling center, a power source and a library. Cells also have factories and industrial parks.

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  • Q:

    What is the difference between smooth and rough endoplasmic reticulum?

    A:

    Smooth endoplasmic reticulum is primarily involved with the production of lipids and removing drugs or poisons from the body, according to the British Society for Cell Biology. Rough endoplasmic reticulum is involved in the production, folding, correcting and dispatching of proteins.

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