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CELL MEMBRANE
all living cells and many of small organelles internal to cells bounded by thin membranes
membranes have mostly phospholipids, proteins usually described as phospholipid bi-layers
also have cholesterol in phospholipid bilayer
in some membranes, only a few cholesterol molecules, in others there are as many as phospholipids according to Audesirk and Audesirk
cholesterol makes bi-layer stronger, more flexible, less fluid, less permeable to liquids
membrane contains more than just phospholipid bi-layer
http://training.seer.cancer.gov/anatomy/cells_tissues_membranes/cells/structure.html
https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcSvvIxIJhxj6ox-KCMdK-APX8oyCrmzePVrn6vboHPL13S-IMoz
CELL STRUCTURE
many different types, sizes, shapes of cells in body
consists of three parts: cell membrane, nucleus, cytoplasm
cytoplasm has intricate arrangements of fine fibers and hundreds/thousands of small but distinct structures called organelles
every cell in body is enclosed by cell membrane
cell membrane separates material outside cell from material inside cell
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