CELL TEST 3
osmosis
drinking sea water causes the loss of water from cells lining the digestive tract
receptor-mediated endocytosis
the molecule to be transported binds to a receptor protein in the plasma membrane; the complex migrates to a specialized coated pit; the pit pinches off forming a vesicle/vacuole
facilitated diffusion
the movement of materials across a semipermeable membrane down their concentration gradients with the assistance of transport proteins
diffusion
the movement of materials down their concentraion gradients
facilitated diffusion
transportr proteins are used to trandport glucose or amino acids down their concentration gradients into the cell
phagocytosis
white blood cells engulf a harmful bacterium
pinocytosis
intake of small droplets of liquid by endocytosis
phagocytosis
intake of solids by endocytosis
osmosis
movement of water across a semipermeable membrane down its concentration gradient
endocytosis
occurs when a small region of the plasma membrane folds inward, pinches off, and forms a vesicle/vacuole
exocytosis
occurs when a vesicle/vacuole fuses with the cell membrane releasing the contents to the outside
active transport
pumping of materials across a membrane against their concentration gradients
active transport
sodium/potassium pump