9 terms

KF 22 transport of substances in cells

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Terms in this set (...)

diffusion
The spreading out of gas or liquid particles from an area of high to low concentration
osmosis
The movement of water molecules across a membrane from high to low (water) concentration
active transport
The movement of dissolved solutes across a membrane from low to high concentration, needs energy!
concentration gradient
The difference in concentration between an area of high concentration and one of lower concentration
water
Which molecules move in osmosis?
down
Do molecules move up or down the concentration gradient in osmosis?
down
Do molecules move up or down the concentration gradient in diffusion?
up
Do molecules move up or down the concentration gradient in active transport?
energy
What does active transport need in order for it to take place?