membrane transport Flashcards
diffusion
molecules move from high to low concentration areas
how do molecules in diffusion move
kinetic energy
factors influencing the rate of diffusio
concentration gradient
temperature
size of molecules
pressure differences
electric gradient
medium
facilitated diffusion
just like regular diffusion except that is uses a transport/channel protein to move solutes across membrane
does faciliated diffusion require energy?
no energy
osmosis
the diffusion of water molecules from high to low through a selectively permeable membrane
do water molecules pass through biological membranes rapidly
yes
areas with high solute concentration have low concentration therefore…
water will move to high solute concentration areas
hypotonic solution
low solute concentration (H2O in) high water concentration
hypertonic solution
high solute concentration (H2O out) low water concentration
isotonic solution
solutions with the same concentration of both solutes and water
active transport
use energy to move molecules against a concentration gradient
2 types of active transport
pumps
movement of the cell membrane
bulk transportation
movement of large molecules in a membrane bond sac called a vesicle across the membrane
endocytosis
bring substances into cell formin a vesicle
