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Villi
Increases the cell surface area in the digestive system
Passive Transport
Requires no energy
Diffusion
Molecules move from an area of high concentration to an area of low concentration
Facilitated Diffusion
Molecules diffuse through a membrane with the help of proteins
Osmosis
The diffusion of water through a selectively permeable membrane
Hypertonic Solution
Too much substance
Hypotonic
Lower concentration of a solution
Isotonic
Equal amount of concentration to the original substance
Active transport
Molecules are moved against the concentration gradient. Requires ATP
Exocytosis
Secretion; things exit cell
Endocytosis
Things enter cell