~5um in diameter contains most genetic material (chromosomes in chromatin DNA and protein) and nucleolus (ribosome subunit synthesis) surrounded by double membrane (nuclear envelope, protein filaments called nuclear lamina that keeps shape of nucleus)
cistarnae (tubules and sacs) continuous with nuclear envelope two types (rough and smooth) lipid synthesis (phospholipids, oils, steroids) carbohydrate metabolism (mobilization of glucose from glycogen in liver) detoxification of drugs in liver calcium ion storage
Smooth ER Function
diverse metabolic functions
muscle cells contain enzymes that pump calcium ions from cytosol to cisternae nerve impulse stimulate a muscle cell calcium goes from ER to cytosol triggering contraction enzymes pump calcium back readying cell for next stimulation
Rough ER Function
protein secretion (glycoproteins carbohydrates attached to protein) contain lipid vesicles
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