Golgi Apparatus- Consists of 4-8 flattened menbranous sacs stacked one upon the other. Located near the nucleus. Principal traffic director for cellular proteins. Major function is to modify, concentrate, and package proteins for export. Protein-containing vesicles pinch off from the Golgi and migrate to the plasma membrane and discharge their contents from the cell by exocytosis. Secretory cells have prominent Golgi apparatus.Lysosomes- Membranous sacs containing hydrolytic enzymes. Provide sites where digestion can proceed safely within the cell. Large and abundant in phagocytes. Function to digest ingested particles, worn-out nonfunctional organelles, non-useful tissues. The breakdown of bone to release calcium ions also reflects lysosomal activity.Cvtoskeletal Elements- An elaborate network of protein structures called microfilaments, microtubules, and intermediate filaments are located through out the cytoplasm. Cytoskeleton
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