BIOB10H3 Lecture Notes - Lecture 7: Secretion, Cell Membrane, Endocytosis
Document Summary
Endocytosis: pinching in of plasma membrane by removing plasma membrane components to form internal compartments called endosomes: helps nutrients and vitamins be moved inward. Endocytic pathway: the name given to this pathway; leads inward from the plasma membrane. Secretory pathway: the name given to this pathway; leads outward from the. Er towards golgi and cell surface (or side route to lysosomes) Lumen: interior space of each membrane-enclosed compartment: allows proteins to travel between compartments, enclosed compartments with space in the middle that are any shape, transport containers. Transport vesicles bud off from the donor compartment and fuse with another compartment: there is soluble cargo in the lumen and cargo molecules stuck in the membrane. Budding occurs to form a vesicle that fuses with the target compartment: discharges it cargo into the target compartment, retrieves escaped proteins to a previous compartment. Only take up appropriate molecules that need to be transport.
