NATS 1675 Chapter Notes -Pinocytosis, Active Transport, Invagination
20 Dec 2013
School
Department
Course
Professor
Document Summary
Movement of molecules from cell membrane across using energy, usually. Against a concentration gradients (not always) - sometimes accelerates downhill. Costs the cell metabolic energy to move substances. Used to not only move molecules, but fundamentally reserves active transport to move molecules the cell needs to sustain life (the cost for using energy) P. 90 diagram - summary of membrane associated process (look at lecture notes) Almost every cell has a socium potassium exchange pump 3na for 2k causes different concentration outside & inside the cell: endocytosis/exocytosis. Large particles/lumps moved into or out of cell. Used for macromolecules too big to get through the cell membrane. The membrane wraps itself around these lumps outer plasma lama wraps and engulfs the lump, then the ends punch together & pinch off the lump which is encapsulated in a portion of the membrane. Phagocytosis: for solid intake (ex rbc) cell eating .
