BI110 Lecture Notes - Lecture 17: Phagosome, Pinocytosis
Document Summary
Bi110-lecture 17-exocytosis and endocytosis (module 19 cont"d) and cell signalling (module 20) Substances are shuttled into, out of, and within a cell through vesicles. In exocytosis, substances are directed out of a cell to be secreted by fusing a vesicle to the cell membrane. In endocytosis, substances are engulfed into a cell by the formation of a vesicle around them. Secretory vesicle transported to the plasma membrane. Vesicle membrane fuses with plasma membrane, releasing contents to the cell exterior. Proteins in vesicle membrane become part of plasma membrane. Bacteria secrete proteins directly into the plasma membrane. Vesicles containing neurotransmitter arrive at the cell membrane. Ca2+ ion triggers the fusion of the vesicle to the membrane. The neurotransmitter is released outside of the cell. Encloses materials outside cell in plasma membrane. Pockets inward and forms endocytic vesicle on cytoplasmic side. Solute and water molecules outside of the plasma membrane. Molecules bind to the receptor proteins on outer cell surface.
