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Endoplasmic Reticulum
Endoplasmic Reticulum -The amount of ER flucuates depending on the cell's activity -There are two types of ER, and they are thought to be continuous
Endoplasmic Reticulum Abbreviated ER -System of membranous tubes and sacs -Functions as an intra- cellular highway, a path along which molecules move from different parts of the cell
Smooth ER -No ribosomes, thus smooth -Builds lipids
Rough ER -System of interconnected, flattened sacs convered with ribosomes -Produces phospholipids and proteins
Smooth ER -In ovaries and testes - produces estrogen and testosterone steroid hormones
Smooth ER -In skeletal and heart muscle cells - releases calcium, which stimulates contraction
Rough ER -In digestive glands - digestive enzymes made on rough ER's ribosomes accumulate within ER, vesicles then separate from ER , they store the enzyme
Please excuse the mispellings in the diagrams, the correct spelling is ENDOPLASMIC
Endoplasmic Reticulum -The shape of ER is quite characteristic of its job -The tubes serve as a way for molecules to travel throught the cell -The ribosomes are attached to the rough ER so that their products can easily be absorbed into the networking system for transportation
