Anatomy

synthesize poteins destined either for incorporation into cell membranes or for export from the cell.

• ("network within the cytoplasm")
• Extensive system of interconnected tubes and parallel membranes enclosing fluid- filled cavities (cisternae)

• External surface is covered with ribosomes
• Well developed in most secretory cells, antibody-producing plasma cells, and liver cells -> produce most blood proteins
• The cell's "membrane factory" b/c integral proteins and phosholipids that form part of all cellular membranes are manufactured there.

Consits of tubules arranged in a looping network

important role in calcium ion storage and release during muscle contraction

• Consists of stacked and flattened membranous sacs
• "traffic director"
• Function: modify, concentrate, and package the proteins and lipids made at the rough ER

• "disintegrator bodies"
• Spherical membranous organelles containing acivated digestive enzymes
• Can digest almost all kinds of biological molecules
• Work best in acidic conditions &are caalled "acid hydrolases"