Biology 2581B Study Guide - Quiz Guide: Secretion, Cell Membrane, Caveolae
2 May 2020
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Document Summary
Molecules are stored in secretory vesicles or synaptic vesicles, which do not fuse with the plasma membrane until they receive an appropriate signal. Happens under influence of ldl: pinocytosis: cells continuously take up parts of the plasma membrane. Use clathrin pits or caveolae vesicles: phagocytosis: special type of endocytosis during which large particles, like bacteria and dead cells are up taken by phagosomes, which then fuse with lysosomes to digest whatever is inside. This process is driven by actin polymerization and reorganization (actin dependent): transcytosis: when receptors are transported from early endosomes into recycling endosomes and transported back to the plasma membrane. Endo- and exocytosis are performed by transport vesicles, which are little membrane enclosed compartments that travel from organelle to organelle budding off one membrane and fusing with another while carrying cargo. Their lumen is equivalent to that of the inside of organelles and the exterior of the cell.
