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MOVEMENT OF SUBSTANCES - Coggle Diagram
MOVEMENT OF SUBSTANCES
Diffusion
Definition: Net movement of particles/molecules from a region of higher concentration to a region with lower concentration, down a concertation gradient.
Substances involved in movement: All solute particles (gas liquid, solute particles)
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Concentration gradient: Down a concentration gradient. (the greater the concentration gradient, the faster the rate of diffusion)
Examples in living organisms: Gaseous exchange in plants and animals, uptake of minerals salts into roots and absorption of nutrients from small intestine into bloodstream.
Other key points: Stops when concentration of particles on both sides are the same and rate of movement of particles in both directions is the same.
Visking tubing: Only small solute molecules can pass through and large molecules are unable to pass through.
Osmosis
Definition: Net movement of water molecules from a solution of higher water potential to a solution of lower water potential, down a water potential gradient, through a partially permeable membrane.
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Concentration gradient: Down a water gradient (the greater the water potential gradient, the faster the rate of osmosis)
Examples in living organisms: Uptake of water into root hair cells, movement of water from plant cell to plant cell and absorption of water by cells.
Other key points: Stops when water potential of solution on both sides are the same and rate of movement of water molecules in both directions is the same.
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