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Unformatted text preview: 3. free ribosomes- scattered throughout cytoplasm 4. attached ribosomes- found on endoplasmic reticulum VI. Endoplasmic Reticulum (ER) A. Structure 1. cisternae- double membranous sacs 2. extend directly from the nuclear membrane 3. granular (rough) ER- have ribosomes attached 4. agranular (smooth) ER- no ribosomes B. Primary Functions Structure of the Cell 1. transport, storage, packaging of materials 2. surface area for cellular reactions 3. granular ER a. synthesis of proteins bound for secretion b. passes proteins to Golgi for processing 4. agranular ER a. storage area for Ca++ (muscle cells) b. lipid synthesis inactivation c. detoxification of harmful compounds (liver)...
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