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10 Cards in this Set

  • Front
  • Back
physical pressure forces molecule through membrane
Simple diffusion
movement of particles from high to low concentration
Simple diffusion of H2O
Membrane Transport
-Selectively permeable: Allows some substances to pass
-Only small uncharged molecules or fat soluble molecules can pass through membrane w/out help
-other molecules require "help"- proteins in plasma membrane can form channels or pumps to help other molecules pass through.
Facillitated diffusion
carrier mediated transport
-form channels
Active Transport
expenditure of energy (ATP) to move solute across membrane UP concentration gradient
into the cell. Membrane invaginates and forms a vesicle. Three types (phagocytosis, pinocytosis, and receptor mediated endocytosis)
"cell eating" membranous vesicle is called "phagosome" Fuses w/ a lysosome-acts as the "stomach" of the cell.
"Cell Dringking" plasma membrane surrounds a tiny bit of extracellular fluid. Pinocytotic vesicle
Vesicular Transport
Out of the cell. Substanse to be released is first enclosed in a membrane-walled sac or vesicle. Migrates to membrane and fuses w/ it to dump out contents.