Cells160-page13

Cells160-page13 - The Golgi functions as a processing...

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Cell - 13 Smooth Endoplasmic Reticulum Smooth endoplasmic reticulum is contiguous with rough, but lacks ribosomes. Many enzymes are associated with the surfaces of smooth ER. The enzymes needed to synthesize the phospholipids for membranes and the steroid hormones are found on smooth ER. Smooth ER is abundant in cells that produce lots of lipids. The sarcoplasmic reticulum of muscle tissue is a form of smooth ER. This contains the calcium reservoirs needed to trigger muscle contraction. Smooth ER in liver cells of animals contains enzymes for many of the liver's regulatory metabolic functions, including detoxifying alcohol. Golgi Bodies The Golgi complex consists of stacks of flattened disk-like membrane sacs that get materials from the endoplasmic reticulum.
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Unformatted text preview: The Golgi functions as a processing center for materials to be packaged up and distributed in organelles or exported (secreted) from the cell in vesicles pinched off of the tips of the Golgi membranes. Digestive enzymes may be packaged for lysosomes and hormones are packaged into vesicles for secretions. Vesicles formed at ER migrate to the Golgi bodies, merge and pass through the Golgi and are packaged and labeled for export in Golgi vesicles. Golgi bodies also modify materials prior to export. The carbohydrate portions of glycoproteins, for example, are added in the Golgi body. Polysaccharides are often manufactured in the Golgi, particularly cell wall components....
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